Add pkg_map support to openvswitch elements

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
Merge "Add pkg_map support to openvswitch elements"