Fix bug in package role defaults

The REFSPEC for engine repos are required in order to be
able to test dependent changes to engine repos. Otherwise,
Ansible repo checkout fails as the sha is not accessible
from the tree.

In addition to that, 2 obsolete repos, infra/swconfig and
infra/test, are removed from defaults.

Change-Id: Ib3b957cfbfdbf10a5851515bea244e6e2220e05c
1 file changed