Deprecated Rpcs and RpcErrors helper classes

With the new RpcResultBuilder class, we can deprecate the Rpcs and
RpcErrors classes.

Also migrate all uses of the deprecated classes to RpcResultBuilder in
the controller code.

Change-Id: I86408bba0ce19e70c7d7a41555e94052e54e93f8
Signed-off-by: tpantelis <tpanteli@brocade.com>
Merge "Deprecated Rpcs and RpcErrors helper classes"