Synced rpc and gettextutils modules from oslo-incubator

The main reason for sync is to get the following oslo-rpc fixes in Neutron:
* I537015f452eb770acba41fdedfe221628f52a920 (reduces delays when reconnecting
  to Qpid in HA deployments)
* Ia148baa6e1ec632789ac3621c85173c2c16f3918 (fixed HA failover, Qpid part)
* I67923cb024bbd143edc8edccf35b9b400df31eb3 (fixed HA failover, RabbitMQ part)

Latest oslo-incubator commit at the moment of sync:
* 2eab986ef3c43f8d1e25065e3cbc1307860c25c7

Change-Id: I2f5bb0d195e050f755ecdbf06a6bbed587a04fbe
Closes-Bug: 1281148
Closes-Bug: 1261631
Cancelling thread start while unit tests running

This change modifies the Radware driver and its unit testing code
to not start operations completion thread while unit tests are running.

The driver initialization changed not to start the operations completion thread,
the thread is started only when operation completion item is inserted into the queue
for the first time.
The operation completion functionality was moved to a new function which
is called by the operations completion thread run() function.
The run() function still have the functionality of popping operation completion
items out of the queue and push failed items back.

Unit testing code mocks the operation completion items queue
by calling the operations completion hanler new function when item
is added.

Start() and join() functions of the thread were mocked to do nothing.

All sleep() entrances were removed from the unit testing code.
All unnecessary mock_reset() calls were removed.

Change-Id: I72380bf223be690831aba1fc29c3dca910245516
Closes-Bug: #1245208
Merge "Synced rpc and gettextutils modules from oslo-incubator"
Merge "Cancelling thread start while unit tests running"