Decrease policy logging verbosity

Log enforced rules only in case policy check has failed.

Change-Id: I1fe8cbc1c9b5084b9cef6aa8329780512d8c7ec2
Closes-Bug: #1385266
Merge "Decrease policy logging verbosity"
Drop usage of RpcProxy from DhcpPluginApi

Drop the usage of the RpcProxy compatibility class from the
DhcpPluginApi RPC client class.  The implementation has been updated
to use the appropariate APIs from oslo.messaging directly.

Part of blueprint drop-rpc-compat.

Change-Id: I81bfd761707c4c587b12877668c4399efe3d652e
Fix client side versions in dhcp rpc API

The dhcp rpc API has two version (1.0 and 1.1).  The proper way to use
versioning for this is to only specify '1.1' from the client side when
you require that the remote side implements at least version '1.1' for
the method to work.  Otherwise, '1.0' should still be specified.  The
previous code specified '1.1' always.

Related to blueprint drop-rpc-compat.

Change-Id: I9468f8f67d80c5d064137f917fc04f9335a3ed55
Merge branch 'master' of https://github.com/openstack/quantum