[split] scrooge-generator: fixed imports for union

RB_ID=195821
[split] scrooge-generator: remove deprecation warnings removed deprecation warnings for FutureIface, FinagledClient, and FinagledServer.  Since Jeff is working on finagle-free code generation, there is no good reason to push people off of these classes onto the replacements I added, only to deprecate those classes in the near future.

RB_ID=200629
[split] bump scrooge to 3.9.2-SNAPSHOT - bump scrooge to 3.9.2-SNAPSHOT - release 3.9.1 of scrooge - update scrooge version in sbt - bump scrooge patch - update changelog

RB_ID=204756
Merge branch 'tmp'