CLOUDSTACK-5492: UI > Routers > Group by zone/pod/cluster/account > (1) fix a bug that requiresUpgrade wrongly showed"No" when it should show "Yes".
(2) detailView > add new field "Total of Virtual Routers that require upgrade".
CLOUDSTACK-5502 createVlanIpRange, allow untagged to be accepted per previous use,
equate empty string to untagged in api parameter input
CLOUDSTACK-5831: UI > Volumes > take snapshot > get "quiescevm" property from listVolumes API instead of listStoragePools API since regular-user/domain-admin don't have access to listStoragePools API.