Freeze framework integ test to latest version (#359)

Author: yangaws

tests/conftest.py

@@ -20,6 +20,11 @@
 
 from sagemaker import Session
 from sagemaker.local import LocalSession
+from sagemaker.chainer.defaults import CHAINER_VERSION
+from sagemaker.pytorch.defaults import PYTORCH_VERSION
+from sagemaker.mxnet.defaults import MXNET_VERSION
+from sagemaker.tensorflow.defaults import TF_VERSION
+
 
 DEFAULT_REGION = 'us-west-2'
 
@@ -91,21 +96,21 @@ def chainer_version(request):
     return request.param
 
 
-@pytest.fixture(scope='module', params=['1.4.1', '1.5.0', '1.6.0', '1.7.0', '1.8.0'])
+@pytest.fixture(scope='module', params=[TF_VERSION])
 def tf_full_version(request):
     return request.param
 
 
-@pytest.fixture(scope='module', params=['0.12.1', '1.0.0', '1.1.0', '1.2.1'])
+@pytest.fixture(scope='module', params=[MXNET_VERSION])
 def mxnet_full_version(request):
     return request.param
 
 
-@pytest.fixture(scope='module', params=["0.4.0"])
+@pytest.fixture(scope='module', params=[PYTORCH_VERSION])
 def pytorch_full_version(request):
     return request.param
 
 
-@pytest.fixture(scope='module', params=['4.0.0', '4.1.0'])
+@pytest.fixture(scope='module', params=[CHAINER_VERSION])
 def chainer_full_version(request):
     return request.param