Update python version to PEP440 compliant number
Update python version to PEP440 compliant number

Running `python setup.py install` to install midonetclient from its home
directory (midonet/python-midonetclient), it complains the version is
not PEP440 compliant (https://www.python.org/dev/peps/pep-0440/). Moving
to current MidoNet version number.

Change-Id: Ieb3d18b3a7cbf13e7d2fa7ea5febb24d1f98d5cc

celebdor/python-midonetclient,celebdor/python-midonetclient