Eliminate requirement of installing 3rd party plugin on every CC connector

Display available hypervisors and cloud services based on the selected zone. In Full Configuration, when creating hosting connections, you're required to select a zone before selecting a connection type.  The Connection type drop-down list displays hypervisors and cloud services available with the zone. (Previously, to ensure the Connection type list shows a required hypervisor or cloud service, you had to install its plug-in in every zone. With this new configuration sequence, you can now install the plug-in only in the required zone.)