When we create agent gateway port on all the nodes irrespective
of the floatingips we can basically use that agent gateway port to
forward traffic in and out of the nodes if the address_scopes match,
since we don't need SNAT functionality if address scopes match.
If a gateway is configured and if it has internal ports that belong
to the same address_scopes then no need to add the redirect rules.
At the same we should also add a static route in the fip namespace
for every interface that is connected to the router that belongs to
the same address scope.
Change-Id: Iaf6d3b38b1fb45772cf0b88706586c057ddb0230
Closes-Bug: #1577488
fb2093c365