Allow unsharing a network used as gateway/floatingip

If network has ports that connect it as gateway to another network, such
as an external network, or "floating ip" ports it should still be
possible to "unshare" it since these ports represent usage of the
network as an external network, not as a VM data network.

Change-Id: Ic33ae7ac193e4fc9fe06a4cfd579a4aacf0e6354
Closes-bug: #1293184
Fix enums usage for postgres in migrations

For downgrade with postgres it is not enough to just drop_table if
table contains enums. The enums should be removed separately after
deleting the table.

Also, if a migration uses an existing enum then postgresql needs some
specific code to re-use this enum.

Closes-Bug: #1243213

Change-Id: Ie5bb8282f7b289c917679192a0d722eb29b8d30f
Audited attribute for policy update not changing

Updating firewall policy with shared, name or description is not changing the
audited attribute to false. Modified firewall policy update to make audited
to false.

Change-Id: Ic3f3e08190dcdaa8f4ecda729bdb2fdf1bdadc52
Closes-bug: 1327063
Use correct section for log message if interface_driver import fails

If import of interface_driver in namespace_driver fails then message for
logger raises exception because of taking interface_driver from haproxy
section while actual interface_driver is in default section.

Closes-Bug: #1350320
Change-Id: Ic1e73c0cdccb2fff02f2adfbad677503c29ba88a
Merge "Allow unsharing a network used as gateway/floatingip"
Merge "Use correct section for log message if interface_driver import fails"
Merge "Audited attribute for policy update not changing"
Merge "Fix enums usage for postgres in migrations"