Add tests to run for py34 env
Add tests to run for py34 env

'tox -e py34' fails to start if no tests are defined for py34 env.
Added py34 section in tox.ini defining list of tests that should be
executed for py34 environment.

Change-Id: Ib515a751a0d49c4af8a99b4e262d7101c96476d2

openstack/networking-infoblox,openstack/networking-infoblox