Migrate finagle-thrift/finagle-stream tests to ScalaTest

In preparation for 2.11.x finagle-thrift tests will migrate to ScalaTest


Remaining Work:
1) Finagle-Streams
2) 2.11.x testing
3) Conversation about FinagleClientThriftServerSpec structure
4) Renaming tests from *Spec -> *Test
5) Clean up commit history and conform to commit message standards
These are skipped because they break.  I am unclear whether they should be deleted or left to pass later (with future dtab work).  

Please advise.  Failures output here: https://gist.github.com/bajohns/7f9c4db337164e6a0faf