CLOUDSTACK-4596: CloudStack is currently allowing same ip range to be
defined in different VLANs across public and portable ranges

added checks to restric same ip range to be configure as both public ip
range and portable ip range
CLOUDSTACK-4811:Fixed zone creation wizard is allowing to accept wrong sub net mask which is cauing wrong cidr value for a given ip range

Signed-off-by: Jayapal <jayapal@apache.org>