CLOUDSTACK-8059: test_host_high_availability.py - Adding necessary code to check the hosts in cluster and update the host with appropriate tags to make it HA enabled

Signed-off-by: SrikanteswaraRao Talluri <talluri@apache.org>
CLOUDSTACK-8057: test_dedicate_guest_vlan_range.py - Marking a test as invalid

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