move cisco-specific extensions to Cisco extensions directory

bug 1126661

Change-Id: I2581203e90c95dad3ffbe64888e71fc3a59f8f53
L3 port delete prevention: do not raise if no IP on port

Bug #1104337

This patch alters the prevent_l3_port_deletion logic.
PortInUse is raised only if the port has a device owner in
(router_interface, router_gateway, floatingip) and an IP
address.
If no IP address is found on the port the port itself can
be considered stale and therefore deleted as any association
with l3 entities would be void.

Change-Id: I9d711b2a9d2cbcc8be481f1751f51fe5b9f01327
Imported Translations from Transifex

Change-Id: Id338050311494e6951bf678658bd07faafeb348a
Merge "move cisco-specific extensions to Cisco extensions directory"
Merge "Imported Translations from Transifex"
Merge "L3 port delete prevention: do not raise if no IP on port"