CLOUDSTACK-7802: test_vpc_network.py - Increasing polling period for network state check

Signed-off-by: SrikanteswaraRao Talluri <talluri@apache.org>
CLOUDSTACK-7801: test_volumes.py - Fixed import and pep8 issues

Signed-off-by: SrikanteswaraRao Talluri <talluri@apache.org>
CLOUDSTACK-7685: Fixed copy template method call in test_escalations_template.py. Removed unbound method of the same name as bound method from base library and changed method call accordingly

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