Support force-deletion of servers.

If reclaim_instance_interval > 0 in nova.conf, some testcases will
fail cause of resource's state is 'in-use'. This patch adds the logic
in `wait_for_server_termination` that if the virtual machine state is
 SOFT_DELETED, then call `force_delete`.

Change-Id: I406188ac2aa54419fa4e44f547ae80a31b58b858
Closes-Bug: #1850568
1 file changed