Version pinning does not match community constraints
Version pinning does not match community constraints

Issues:
Fixes #64

Problem:
Travis builds fail in f5-openstack-lbaasv2-driver due to installing new (wrong!) library versions that don't match constraints.

Analysis:
setup.py in liberty, mitaka and master need to specify versions from the community constraints file. This repo is strictly for use with F5 OpenStack projects, and should enforce appropriate constraints, not arbitrary versions from whenever code in this repo was created.
Drop package dependencies that are not directly used by this repo.  Set versions to match those specified in upper-constraints from community openstack for this branch.

Tests:
Confirmed travis builds pass in developer fork.

F5Networks/f5-openstack-test,pjbreaux/f5-openstack-test