webadmin: Blocking port field in edit host popup and refactor its name

Was a bug, before we locked the vdsm port (54321) field, instead of the
auth port. To avoid such confusions this patch also modifies the name of the
field from hostPort to authSshPort.

Change-Id: Ic2af8e3168d7ac9688079f6a32edc71d79f997b0
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=997542
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>