Syntax check for YAML file

translation_team.yaml is now used by stackalytics.
It is a good idea to YAML format check in pep8 check.

Change-Id: I33f6311412a5cb67692992e1ba021d56eede7ce5

test-requirements.txt

@@ -7,3 +7,4 @@ hacking<0.11,>=0.10.2 # Apache-2.0
 Babel>=2.3.4 # BSD
 sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2 # BSD
 oslosphinx!=3.4.0,>=2.5.0 # Apache-2.0
+PyYAML>=3.1.0 # MIT

tools/check_yaml_file.py

@@ -0,0 +1,31 @@
+# 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 argparse
+
+import yaml
+
+
+def main(parsed_args):
+    filename = parsed_args.filename
+    with open(filename) as f:
+        data = f.read()
+    yaml.safe_load(data)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('filename')
+    parsed_args = parser.parse_args()
+
+    main(parsed_args)

tox.ini

@@ -19,4 +19,5 @@ commands = sphinx-build -W -b html doc/source doc/build/html
 commands =
   flake8
   bash -c "find {toxinidir} -type f \( -name '*.po' -o -name '*.pot' \) -print0 | xargs -0 -n1 --no-run-if-empty msgfmt --check-format -o /dev/null"
+  python {toxinidir}/tools/check_yaml_file.py {toxinidir}/tools/zanata/translation_team.yaml
 whitelist_externals = bash