Do not instantiate FluentIterable

We are performing an immediate transformation of the iterrable.
Instead of that we can immediately use Collections2.transform(), saving
an object.

Change-Id: Ie943a0a79e04713427bf6470e06d921412ebb179
Signed-off-by: Robert Varga <rovarga@cisco.com>
Registry instance cannot be null in RpcProxyRegistration

removeRegistration() is guaranteed to be invoked at most once, and
registry cannot be null. Make it final and remove the safety check.

Change-Id: Ie8f2da7430c076d0bec71eb8b58a4adc2af25adf
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "Do not instantiate FluentIterable"
Merge "Registry instance cannot be null in RpcProxyRegistration"