Have been seeing intermittent failures of the test_delete_user()
functional test. Have made the following changes to hopefully resolve
the issue and if it still fails to know better why the failure
occurred.

*  Extend the wait timeout for test_delete_user() from 30 to 60
   tries of 0.5 seconds each.

*  Modify wait_for_sidekiq() to return True if sidekiq process
   terminated. Return False if the timeout expired.

*  Modify wait_for_sidekiq() to loop through all processes instead of
   assuming there is only one process. If all processes are not busy
   then return.

*  Modify wait_for_sidekiq() to sleep at least once before checking
   for processes being busy.

*  Check for True being returned in test_delete_user() call to
   wait_for_sidekiq()

feat: add release links API support

Since there are two groups we can't depend on the one we changed to
always be the first one returned.

Instead fetch the group we want and then test our assertion against
that group.