Squid: Avoid cycle between java packages

https://trello.com/c/A0rrIWb0

Resolved packages dependency cycles in MOTECH MRS CouchDB
* Moved logic of converting MRSObservation to CouchObservation from
  utils to CouchObservation

Change-Id: I5448c52b73c16c1b33cedbfbd9a47839c0c85ec4