The puppetlabs-rabbitmq module introduce a new feature related to the
erlang_cookie parameter change (the database must be wiped if the cookie
is changed), the parameter wipe_db_on_cookie_change is configured to
false by default. But we're not setting up a rabbitmq cluster and we're
not using pacemaker in beaker CI tests, so we just remove the erlang
cookie parameter change.
Change-Id: I4fe5bd457ca21fb7d2f72f69158f70f8c68af064
Closes-Bug: #1468444
fd29cbdcee