The live_migration_uri was removed in
Ifea82dc03a859356eb55b097aa5747e3fa0c40ba since it is currently a
deprecated config option. However, nova has not adequately implemented
the replacement config vars for Pike, so the deprecated option must
be used to configure live migration with SSH settings[1].
The deprecated option can be removed once the nova bug is resolved.
This also pulls in the change from Ia389e78994da0f5f1cd99edeafeef13009906621
which is needed to perform SSH tunnelled migrations.
[1] https://bugs.launchpad.net/nova/+bug/1671288
Change-Id: I72d70d3621e5446c70008f6d680c7e315b05e150
12e09a3402