Ensure that the tree is updated when the "View" options change in the main window

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
Update DeleteVMCommandTest to use the correct command.

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
Deregister event handlers in OtherConfigAndTagsWatcher

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>