Maru Newby 235578ef47 Stop removing ip allocations on port delete
The _delete_port() method was manually removing related
IPAllocation instances despite the existence of a perfectly
good cascade deletion relationship in the model.  This patch
puts an end to that nonsense and the potential for deadlock that
it represented.

Closes-bug: #1288379
Related-Bug: #1283522

Change-Id: Ib31550fa9000fc75768a327cb6cc1c419e06568f
2014-03-18 00:52:06 -07:00
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