Don't map gate-cross jobs automatically to tox jobs
The regex was mapping these too much.
@@ -20,7 +20,7 @@ job-mapping:
- old: noop
new: noop
- - old: '^gate-.*-python(?P<version>[0-9]{2})-ubuntu-xenial'
+ - old: '^gate(?!-cross)-.*-python(?P<version>[0-9]{2})-ubuntu-xenial'
new: 'openstack-tox-py{version}'
- old: '^gate-.*-pep8-ubuntu-xenial'
