flake8: Show error text
flake8: Show error text

in adddition to error code, because the text is more human-readable than
the code.

Changes `testStarted` message from - e.g.:

    ##teamcity[testStarted timestamp='2015-10-22T09:40:02.415' name='E501: smstack/ansible/plugins/teamcity_messages.py:204:80']

to:

    ##teamcity[testStarted timestamp='2015-10-22T09:44:46.852' name='smstack/ansible/plugins/teamcity_messages.py:204:80: E501 line too long (82 > 79 characters)']

throwable-one/teamcity-messages