Distributed port binding need to be implemented for HA router ports
to fix bug 1522980. HA ports can use existing DVR implementation for
multiple port binding. So we have to make current DVR port binding
implementation generic, so that all distributed ports(like DVR, HA)
can use it.
As part of making it generic, we rename 'ml2_dvr_port_bindings' table
to 'ml2_distributed_port_bindings', so that all distributed ports
(DVR, HA ..) can use this table.
Partial-Bug: #1595043
Partial-Bug: #1522980
Change-Id: I24650b7dee6305f801b457c4f21c8b16fb0eb6e0
77bfd82c3c