9dff53ce65
This essentially reverts commit 12d24abba75ab3b926edbac389437bacc23914dd. Making the callback _delete_segments_for_network respond to BEFORE_DELETE network event has created some bugs. In one of them, it is not possible to delete a routed network, because the segments cannot be deleted due to the fact that the associated subnets still exist. Making _delete_segments_for_network respond to PRECOMMIT_DELETE introduces a StaleDataError with the standard attributes of the deleted segments. To work around that, network_db is expired and read again after notifying the PRECOMMIT_DELETE event in delete_network in the DB core plug-in. This also fixes an issue where we could delete the segment ID of the l3-ha network when deleting a router, leaving all other routers non-functioning. Moving this to PRECOMMIT_DELETE fixes it since it is done after we have checked that the network is not in use and can be deleted. Closes-Bug: #1697324 Closes-Bug: #1732543 Change-Id: I7c3c4654f183b317647a28d599a538fe460db68f
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