refactor namespace package - add the first contrib package (#523)

* add the 1st contrib package

* rename test to tests

* address review comments

* move to opencensus.common namespace

Author: reyang

contrib/opencensus-common-correlationcontext/README.rst

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+W3C Correlation Context
+============================================================================

contrib/opencensus-common-correlationcontext/opencensus/__init__.py

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+__path__ = __import__('pkgutil').extend_path(__path__, __name__)

contrib/opencensus-common-correlationcontext/opencensus/common/__init__.py

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+__path__ = __import__('pkgutil').extend_path(__path__, __name__)

contrib/opencensus-common-correlationcontext/opencensus/common/correlationcontext/__init__.py

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+# Copyright 2019, OpenCensus Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from opencensus.common.correlationcontext.correlationcontext import CorrelationContext
+
+
+__all__ = ['CorrelationContext']

contrib/opencensus-common-correlationcontext/opencensus/common/correlationcontext/correlationcontext.py

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+# Copyright 2019, OpenCensus Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+class CorrelationContext(object):
+    pass

contrib/opencensus-common-correlationcontext/setup.py

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+# Copyright 2019, OpenCensus Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from setuptools import find_packages
+from setuptools import setup
+from version import __version__
+
+setup(
+    name='opencensus-common-correlationcontext',
+    version=__version__,  # noqa
+    author='OpenCensus Authors',
+    author_email='[email protected]',
+    classifiers=[
+        'Intended Audience :: Developers',
+        'Development Status :: 3 - Alpha',
+        'Intended Audience :: Developers',
+        'License :: OSI Approved :: Apache Software License',
+        'Programming Language :: Python',
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+    ],
+    description='W3C Correlation Context',
+    include_package_data=True,
+    long_description=open('README.rst').read(),
+    install_requires=[],
+    extras_require={},
+    license='Apache-2.0',
+    packages=find_packages(exclude=('tests',)),
+    namespace_packages=[],
+    url='https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-common-correlationcontext',
+    zip_safe=False,
+)

contrib/opencensus-common-correlationcontext/tests/__init__.py

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+# Copyright 2019, OpenCensus Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

contrib/opencensus-common-correlationcontext/tests/test_correlation_context.py

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+# Copyright 2019, OpenCensus Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import unittest
+from opencensus.common.correlationcontext import CorrelationContext
+
+class CorrelationContextTest(unittest.TestCase):
+    def test_ctor_default(self):
+        self.assertTrue(CorrelationContext())

contrib/opencensus-common-correlationcontext/version.py

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+# Copyright 2019, OpenCensus Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+__version__ = '0.2.dev0'