Install openstack-dashboard-test package for suse

Currently, on SLES 11 sp3, if the horizon open debug option, it will
try to import horizon.test module, which doesn't exist, then user will
get a 500 error. Since user may want to enable debug option, we'd better
install the openstack-dashboard-test package.

Change-Id: I31f61e31a259265ee5556d38c135f4c063ec9372
Closes-Bug: #1310188
Merge "Install openstack-dashboard-test package for suse"