Drop RpcProxy usage from ml2 AgentNotifierApi

Remove usage of the RpcProxy compatibility class from the ml2
AgentNotifierApi.  The equivalent oslo.messaging APIs are now used
instead.  A couple of other mixin APIs had to be converted at the same
time.

Note that there is one very minor functional change here.  The base
rpc version is set to '1.0' now instead of '1.1'.  The right pattern
to use is to always set the base to be N.0.  Any method that needs a
newer version should specify it.

Part of blueprint drop-rpc-compat.

Change-Id: I640568e2d73c9eb7a9505db640dc1427a1ae2abe
Drop old code from SecurityGroupAgentRpcApiMixin

The SecurityGroupAgentRpcApiMixin class temporarily had support for
both RpcProxy and new oslo.messaging style rpc client interfaces.  Now
that all users of this mixin have been converted to direct usage of
oslo.messaging APIs, the old compatibility code can be removed.

Part of blueprint drop-rpc-compat.

Change-Id: I18dc65e7f14a8ae42e3c2bc81d1d73f61c12c1fc
Merge "Drop RpcProxy usage from ml2 AgentNotifierApi"
Merge "Drop old code from SecurityGroupAgentRpcApiMixin"