The python-qpid packages must be installed when qpidd is configured

The python-qpid package is available for Ubuntu trusty, precise, and
all the supported RHEL based platforms.  This package is necessary if
qpidd is configured as the RPC backend.  It is the client API used to
talk to the broker, and must be installed on each system that
communicates with the broker.

Change-Id: I635d3e857aa4b769a80cb7cde405cfd6cae44d32
Merge "The python-qpid packages must be installed when qpidd is configured"