Network resources for terminated instances now ignored - EUCA-8823

Network resources for cluster controller reported instances in the
Teardown state are no longer treated as in-use.

EUCA-8823
Rollback partial allocation of network resources for edge - EUCA-8813

Network service implemenations now roll back network resources on
failure after partial allocation. Pending private IP addresses are now
timed out.

EUCA-8813
Merge remote-tracking branch 'origin/dev/sjones/EUCA-8823' into testing