Fix cross python27 job for test-setup.sh
cross-python27 should do the same as python27 does - but it missed the
execution of the optional tools/test-setup.sh file. Add it.
- zuul-git-prep-upper-constraints-cross:
project: openstack/{name}
- install-distro-packages
+ - extra-test-setup
- revoke-sudo
- python27
- assert-no-extra-files
