CLOUDSTACK-2991: [PortableIPRange] CS should not allow portable IP with
sourceNAT service on it

if a portable ip is first IP associated with a non-VPC network, then its
being considered as source nat IP. This fix adds exemption for portable
IP not to be considred for source nat.
Fix url for upload volume test

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
(cherry picked from commit d0a851ec5de261c83babd94a07dd1091f804110d)
CLOUDSTACK-478