Add package name and commit hash to "installed" file
Add package name and commit hash to "installed" file

When a build is completed successfully, and the package is installed
with mock, a zero-size "installed" file is created. We can use this
file to identify the package name and commit hash used to buid the
repo, and this will be useful to the promote job.

Change-Id: I76b5c6e632a068d7cd95942fd16398de8e019f0f

openstack-packages/DLRN,openstack-packages/delorean,openstack-packages/delorean,openstack-packages/DLRN