Remove Nova v3 API endpoint

Nova v3 API has disappeared in Juno cycle, and we don't test the API
now on the gate since If63dcdb2d05aa0fab0b6848a1248b6678f1ee9ad .
This patch removes the endpoint of Nova v3 API.

Change-Id: I85f87b37558a15d1eaaa781b02fec5b02bd2ab44
Fix pkg name for mysql-connector-python on SUSE

The correct package name on SUSE distros is python-mysql-connector-python.

Change-Id: I5250356f782f149f87f3d0ffba3380911fa437be
Cleanup nova-cinder nova.conf section

Stop using deprecated conf names, don't override default values with
default values.

Change-Id: I2c7e0833a61926b9fc9b5de4e38fdd626501d78d
Stop setting nova.conf settings that mean nothing

* DEFAULT.fixed_range isn't a valid option in nova anymore
* DEFAULT.osci_compute_workers was never a thing, it should be
  DEFAULT.osapi_compute_workers

Change-Id: Ib08f3e20e4685b331385431276f890205fa76da6
Merge "Cleanup nova-cinder nova.conf section"
Merge "Fix pkg name for mysql-connector-python on SUSE"
Merge "Stop setting nova.conf settings that mean nothing"
Merge "Remove Nova v3 API endpoint"
Merge branch 'master' of https://github.com/openstack-dev/devstack