When the OVS agent skips processing a port because it was
not found on the integration bridge, it doesn't send back
any status to the server to notify it. This can cause the
port to get stuck in the BUILD state indefinitely, since
that is the default state it gets before the server tells
the agent to update it.
The OVS agent will now notify the server that any skipped
device should be considered DOWN if it did not exist.
Change-Id: I15dc55951cdb75c6d87d7c645f8e2cbf82b2f3e4
Closes-bug: #1719011
a789d23b02