Sync rpc from oslo-incubator.

Changes include:

 * Fix Copyright Headers - Rename LLC to Foundation
 * Preserve exceptions in impl_zmq.
 * Don't log a traceback on rpc call timeout.
 * Redis-based matchmaker
 * AMQP: skip duplicate messages
 * some other minor fixes / cleanups

Fix bug 1154232.

Change-Id: I8afb6b9a919fca34b4a93f7fad1551a023eba6b2
Fix reconnecting to libvirt.

The right logic was in place for dealing with losing a connection to
libvirt and reconnecting.  However, it was observed that we actually get
VIR_ERR_INTERNAL_ERROR, VIR_FROM_RPC after restarting libvirtd.  The
code is just updated to deal with INTERNAL_ERROR.

Fix bug 1154473.

Change-Id: Idf4abf3fe485cf534f1732e4340fc35652fec003
Merge "Sync rpc from oslo-incubator."
Merge "Fix reconnecting to libvirt."