[VVP] updating ports.py to check str_replace params

[VVP] updating ports.py to check str_replace params

allowed_address_pairs/ip_address can use CIDR format,
and is often done by using the intrinsic function str_replace.

This update will naively go through each param in a str_replace to
check if one is a valid allowed_address_pair/ip_address parameter.

Issue-ID: VVP-341
Signed-off-by: stark, steven <steven.stark@att.com>
Change-Id: I24e7ad6b74e5795b577d99468517287be46cd2b7