searching for through collection of objects should use find_match

 Update the following functions to use find_match
 which is a helper function for searching through fog objects
 for objects by id or name.  Sometimes we use id's so 
 this needs to be handled.
 
 -  get_flavor
 -  get_networkid
 -  get_image

Change-Id: I591150677d0f7bc2844ab9e0e46c330f6f6076ef