Previously launchpad_id was set for all records, but we already
have primary key 'user_id' that should be used instead.
When merging two profiles it is possible that there are 2 known
launchpad ids or gerrit ids for the same user. Now processor writes
info-level message for such profiles
This makes code more readable, and can check whether specific library
in the requirement files easily. We also enforce the check in pep8.