CLOUDSTACK-7823: test_snapshots.py - remove test case dependency on each other

Signed-off-by: SrikanteswaraRao Talluri <talluri@apache.org>
CLOUDSTACK-7818: Fixing test_escalations_instances.py, Removing dependency of test cases on each other

Signed-off-by: SrikanteswaraRao Talluri <talluri@apache.org>