Openvswitch elements install openvswitch from packages. This is not needed on RH family distros, and on SuSE they use a different name. Adding support for pkg_map so we can address all this differences. Change-Id: I257ecede6f4fe0b7e6ee7b9ce660d5bfade06a1e
Install openvswitch from packages.
Enables the openvswitch service for systemd systems and and adds an upstart script service to override the default sysv one on systems with upstart.