CLOUDSTACK-8001: test_add_remove_network.py - Tag invalid test case as invalid

Signed-off-by: SrikanteswaraRao Talluri <talluri@apache.org>
CLOUDSTACK-7993: Code enhancement - test_egress_fw_rules.py - Removing unncessary waits

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