CLOUDSTACK-8095: Fixed Iso attach issue in test_escalations_instances.py

Signed-off-by: SrikanteswaraRao Talluri <talluri@apache.org>
CLOUDSTACK-8100: Fixed pep8 issues in test_vpc.py

Signed-off-by: SrikanteswaraRao Talluri <talluri@apache.org>
CLOUDSTACK-7762 -[Automation] - Fix test failure for test_02_revert_vm_snapshots in smoke/test_vm_snapshots.py