pbr provides VersionInfo.version_string() as a method to determine
the version. mistral.version.version_string can hide this and
provide a uniform string interface to config and launch.
This fixes a problem with mistral-server --version generating
an exception because the version passed to argparse was a method
instead of a string.
Change-Id: Ie468685e4360bfaec5d82b02f8cf1a27a93bcd94
Closes-Bug: 1796921
* Adding required dependencies to use and test pecan/wsme app
* Adding additional modules from oslo-incubator
* Adding configuration files mistral.conf and specific file
loggin.conf for logging
* Adding dependencies for testing: fixtures, testtools, mock
* Updating tox.ini to run nosetests for py26 and py27 environments
Change-Id: I4fd63820aaaf3b50fb1c981031f60faa68a6d307