add stable-compat jobs for tempest and devstack-gate for pike
add stable-compat jobs for tempest and devstack-gate for pike

Depends-On: Iea7e64530138b21c246a7c01dfe22c833f5a2b2e
Change-Id: I936cecb5c2deb1e8e4444a605c54764bae930945
Signed-off-by: Doug Hellmann <0798ebecfb7bc4dfb9d0445c2fa030eb64e1fa1c@doughellmann.com>

openstack-infra/project-config,openstack-infra/project-config