The user's network to create instance should not conflict with the
management network.
This patch also fixes the bug in trove-guestagent:
AttributeError: 'TroveContext' object has no attribute 'notification'
which has been merged in master branch in
https://review.opendev.org/#/c/697225/
Change-Id: I922a1c5469309704cc6dd60a1ef57e43a98a3c00
(cherry picked from commit 263339b4db)