Disable voting on openstack-tox-py27
Disable voting on openstack-tox-py27

We believe there is a recent change in stestr that might break python27:
https://github.com/mtreinish/stestr/commit/af0fdae10d9df669d45ccdd152a1ee9da83cc1f0

Until we figure it out, let's disable py27 testing which anyway will be
removed soon once we roll out centos8 testing.

- Disabling voting on openstack-tox-py27
- Remove it from the gate queue
- Stop using the openstack-python-jobs template

Change-Id: I2973ab7c6385f56ccb46f0f0cc82f32cfc56c87c

openstack/python-tripleoclient