Log when dependency job is enabled with unsupported storage

[jpkrohling]

Follow-up from #140: that PR adds a log.Info on the default case (Enabled=false for Cassandra and ES), while it doesn't let the user know that the dependency job isn't installed when Enabled=true and storage isn't Cassandra or ES.

It should:

1. Not log anything on the standard, common case. If everything is as it should, there's no need to log anything
2. Log (debug or info) when Enabled=true and the storage isn't ES or Cassandra. This is because the flag is false by default, meaning that the user has explicitly set the value to true, so, there's a clear expectation that the job will be installed.