Use kokoro for testing (#580)

* Use kokoro for testing

* Remove coveralls

Author: busunkim96

.kokoro/build.sh

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+#!/bin/bash
+
+set -eo pipefail
+
+cd github/google-api-python-client
+
+# Disable buffering, so that the logs stream through.
+export PYTHONUNBUFFERED=1
+
+python3 -m pip install --upgrade tox
+
+# Run tests
+tox

.kokoro/common.cfg

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+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Download trampoline resources.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
+
+# Use the trampoline script to run in docker.
+build_file: "google-api-python-client/.kokoro/trampoline.sh"
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/python-multi"
+}
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/google-api-python-client/.kokoro/build.sh"
+}

.kokoro/continuous.cfg

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+# Format: //devtools/kokoro/config/proto/build.proto

.kokoro/presubmit.cfg

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+# Format: //devtools/kokoro/config/proto/build.proto

.kokoro/trampoline.sh

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+#!/bin/bash
+# Copyright 2017 Google Inc.
+#
+# 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.
+set -eo pipefail
+# Always run the cleanup script, regardless of the success of bouncing into
+# the container.
+function cleanup() {
+    chmod +x ${KOKORO_GFILE_DIR}/trampoline_cleanup.sh
+    ${KOKORO_GFILE_DIR}/trampoline_cleanup.sh
+    echo "cleanup";
+}
+trap cleanup EXIT
+python3 "${KOKORO_GFILE_DIR}/trampoline_v1.py"