TT#148100 support IPv6 CIDR notation for allowed ips

for IPv4, ipnet length of 3*4 + 3 + 1 + 2 = 18 was
sufficient. for IPv6 ipnets we need to extend this
to 8*4 + 7 + 1 + 3 = 43 chars.

Change-Id: I9b44c63b58bc08bc41f0d50a9ec94234ffffd6c2

db_scripts/diff/15702.down

@@ -0,0 +1,2 @@
+use provisioning;
+alter table voip_allowed_ip_groups modify column ipnet varchar(18) not null;

db_scripts/diff/15702.up

@@ -0,0 +1,2 @@
+use provisioning;
+alter table voip_allowed_ip_groups modify column ipnet varchar(43) not null;