removing extra "Received request" log

with_transaction_id generates transaction id and binds to the log it
passes. This is also there in handlers inside OtterLaunch and
OtterPolicies which is the right place since they are handling request.
This caused extra "Received request" message for each message inside
OtterLaunch and OtterPolicies.
Merge pull request #566 from rackerlabs/with_trans_cleanup

removing extra "Received request" log