Add support for mangelwurzel node
Remove memento_enabled and gemini_enabled from /etc/clearwater/config as they're no longer required
Merge pull request #146 from Metaswitch/memento-iss21

[No review required] Remove memento_enabled and gemini_enabled from /etc/clearwater/config as...
Merge pull request #145 from Metaswitch/mangelwurzel

Reviewer MIRW: Add support for mangelwurzel node