NVP plugin:fix connectivity to fip from internal nw

The current set of NAT rules configured in the NVP logical router
prevents instances on an internal network from establishing TCP
connections with a floating IP associate with an internal port
on the same Neutron network.

This patch add a SNAT rule to ensure connections coming from the
internal network always appear to the port associate with the
floating IP as coming from the external network.

Change-Id: I12da12ee136c61fddb04f2b216382b51d751a02c
Closes-Bug: 1221419
MidoNet: Added support for the admin_state_up flag

This commit enhances the port, bridge and router resources with the
admin_state_up flag in the MidoNet plugin.

Implements: blueprint midonet-admin-state
Change-Id: I67f4f9ad4099a05f8161aae79331ebba84f561b8
Imported Translations from Transifex

Change-Id: I26f10ec24fa6684284d6946e541fc6fe26f36d6f
Merge "NVP plugin:fix connectivity to fip from internal nw"
Merge "Imported Translations from Transifex"
Merge "MidoNet: Added support for the admin_state_up flag"