This wires in the get_dlrn_hash function to the release dictionary,
so that we end up with an actual dlrn hash instead of a named hash.
Release dictionary tests updated to mock this function, including
verification of the expected calls to get_dlrn_hash.
This also adds more comprehensive logging and unittests to the
Add method for getting dlrn_hash from release and hash_name
This method will parse the full repo hash from the delorean.repo
file in a similar way to what we currently do via bash in the
release files. In the future, it may be better to just get this
data directly via the DLRN API.
Unittests included which assert the validity of the regex used
to parse the delorean.repo file, as well as the format of the