CLOUDSTACK-4089: UI > zone wizard > hypervisor VMware > multiple physical networks > edit Public/Guest traffic type > fix a bug that vSwitch Type dropdown selection didn't remain after Public/Guest traffic type is dragged to another physical network.
UI > Infrastructure > clusters > Add cluster dialog > change variable name for Nexus DVS fields to be more intuitive.
CLOUDSTACK-4089: UI > zone wizard > VMware hypervisor > physical network > edit Public/Guest traffic type > vSwitchType dropdown > set default option upon configuration 'vmware.use.dvswtich' and 'vmware.use.nexus.vswitch'.
CLOUDSTACK-4089: UI > zone wizard > VMware hypervisor > physical network > edit traffic type > set default value for vSwitchName field upon selected vSwitchType.
get host credentials from marvin configuration for ssvm test
(cherry picked from commit 6371d3b98c56784e4a3588c2546be18aa79cb595)
Prep for merge with master