Point at the master branch on github
Point at the master branch on github

Issues:
Fixes #321

Problem: We previously pointed prodactivity at a tag that went stale
when new features were merged from development.

Analysis: We now point at the master branch.  Provided that the
master branch only grows when properly tested code is accepted
through the PR mechanism.

Tests:

mattgreene/f5-openstack-lbaasv2-driver,F5Networks/f5-openstack-lbaasv2-driver,richbrowne/f5-openstack-lbaasv2-driver,richbrowne/f5-openstack-lbaasv2-driver,mattgreene/f5-openstack-lbaasv2-driver,jlongstaf/f5-openstack-lbaasv2-driver,F5Networks/f5-openstack-lbaasv2-driver,jlongstaf/f5-openstack-lbaasv2-driver,jputrino/f5-openstack-lbaasv2-driver,jputrino/f5-openstack-lbaasv2-driver