Fix FWaaS plugin to allow one firewall per tenant

The reference implementation of the FWaaS iptables
agent/driver supports only one firewall per tenant
in Havana release. However, the FWaaS plugin will
let you create more than one firewall. This is
being fixed in this patch to not allow creating
the second firewall if a firewall already exists
for the tenant.

Change-Id: I8f1cad9791723ba919b5774a63982c204686ddfe
Closes-Bug: #1228442
Apply VPN migration to correct plugin

This patch ensures the migration is executed when
VPNDriverPlugin is loaded among service plugins.

Bug 1229394

Change-Id: Ibf50d23aebc60b2ba22ef5a51c268b93761c2171
Port Cisco nexus subplugin UT to ML2 mech driver UT

Fixes bug 1227889

This fix ports the Cisco Nexus sub-plugin unit tests
(neutron/tests/unit/cisco/test_nexus_plugin.py) to the Cisco ML2 mechanism
driver. The new test script will be
neutron/tests/unit/ml2/drivers/test_cisco_nexus.py.

Test cases which will be excluded from this port:
    - Test cases involving provider networks.
    - Test cases involving add/remove router networks
since these features are not currently supported in the Cisco ML2
mechanism driver.

Change-Id: I7aed85031cf402c418089d263c7e949c4631b1eb
Neutron network delete fails with brocade plugin

Fixes bug: 1223747

Change-Id: I4a8235d4dcb0c14477835afafd0b5459ce6b01f6
Imported Translations from Transifex

Change-Id: I3752ae949a430854eceea2cc10f08024e9a566d7
Properly synchronize status for ports deleted from backend

Ensure that the status for a port is properly synchronized even
when the port itself does not exist anymore in the backend, avoiding
raising exceptions due to missing results in the NVP query.

This patch also adjusts a comment and improves exception handling
in _nvp_get_port_id

Bug 1229331

Change-Id: Ibaa581006c994a543c1795dd3f1d50086583b953
Merge "Apply VPN migration to correct plugin"
Merge "Neutron network delete fails with brocade plugin"
Merge "Imported Translations from Transifex"
Require oslo.config 1.2.0 final

Now that 1.2.0 has been released, require it rather than one of the beta
release tarballs.

Closes-Bug: #1182861
Change-Id: I75ffc4a572d14488d19491a38742d6920951c171
Merge "Properly synchronize status for ports deleted from backend"
Merge "Port Cisco nexus subplugin UT to ML2 mech driver UT"
Merge "Require oslo.config 1.2.0 final"
Merge "Fix FWaaS plugin to allow one firewall per tenant"