Removed a warning message from automation log

We log a warning everytime a service model is not found. Which includes
basic ruby objects. e.g.
[----] W, [2014-06-20T13:01:03.092624 #3049:3fe521833bdc]  WARN -- :
Service Model string not found
Merge pull request #84 from mkanoor/noise_in_log

Removed a warning message from automation log