Add support for generating agent-ovs RPMS on suitable platforms.
  * Remove dependency on boost::log needed for RHEL7
  * Fix a number of compiler warnings
  * Add spec file and systemd unit file for RHEL7
  * Some tweaks for libopflex spec file

Change-Id: I02c29e34db89f263e13e5d2d772fb6f4d84426a3
Signed-off-by: Rob Adams <readams@readams.net>