Oleg Bondarev 6c86eee680 ML2 plugin should not delete ports on subnet deletion
On subnet deletion ports are deleted asynchronously by dhcp agent
so plugin doesn't need to delete them itself.
Instead Ml2Plugin.delete_subnet() method should call update_port()
for each allocation to remove the IP from the port and call the MechanismDrivers.
The patch also adds subnets test suite from test_db_plugin to test_ml2_plugin.

Closes-Bug: #1246737
Change-Id: I7cf0461e9a3cfec4921e2de41fb1ab3fc119fddc
2013-11-22 10:41:03 +04:00
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