CLOUDSTACK-2670. Migrate volume doesn't allow migration of volumes of a stopped vm.
The findStoragePoolsForMigration and migrateVolume api were explicitly blocking moving
a volume if the instance to which it was attached was stopped. Updated the check for
the same.
CLOUDSTACK-2729: increase waiting timeout for global file lock to 300 seconds
(cherry picked from commit 6d86af85baa57bb20ec9642cbd1cd82c002dcfef)