[sr-dev] [kamailio/kamailio] ipops is_in_subnet failure with IPv6 after upgrade to 5.0.0 (#1018)

[Anthony Messina]

After upgrading to 5.0.0, I've found that using an IPv6 range such as 
```
is_in_subnet("$si", "2001:db8::/32"))
```
 no longer works.  In fact, the script just terminates without error or response:
```
ERROR: *** cfgtrace:request_route=[REGISTRAR] c=[/etc/kamailio/kamailio.cfg] l=1150 a=16 n=if
ERROR: *** cfgtrace:request_route=[REGISTRAR] c=[/etc/kamailio/kamailio.cfg] l=1148 a=25 n=is_method
ERROR: *** cfgtrace:request_route=[REGISTRAR] c=[/etc/kamailio/kamailio.cfg] l=1160 a=16 n=if
ERROR: *** cfgtrace:request_route=[REGISTRAR] c=[/etc/kamailio/kamailio.cfg] l=1150 a=41 n=isflagset
ERROR: *** cfgtrace:request_route=[REGISTRAR] c=[/etc/kamailio/kamailio.cfg] l=1151 a=25 n=setbflag
ERROR: *** cfgtrace:request_route=[REGISTRAR] c=[/etc/kamailio/kamailio.cfg] l=1164 a=16 n=if
ERROR: *** cfgtrace:request_route=[REGISTRAR] c=[/etc/kamailio/kamailio.cfg] l=1160 a=26 n=is_in_subnet
DEBUG: <core> [core/receive.c:275]: receive_msg(): request-route executed in: 1240 usec
DEBUG: <core> [core/usr_avp.c:631]: destroy_avp_list(): destroying list 0x7f5860b8e778
DEBUG: <core> [core/usr_avp.c:631]: destroy_avp_list(): destroying list (nil)
DEBUG: <core> [core/usr_avp.c:631]: destroy_avp_list(): destroying list (nil)
DEBUG: <core> [core/usr_avp.c:631]: destroy_avp_list(): destroying list (nil)
DEBUG: <core> [core/usr_avp.c:631]: destroy_avp_list(): destroying list (nil)
DEBUG: <core> [core/usr_avp.c:631]: destroy_avp_list(): destroying list (nil)
DEBUG: <core> [core/xavp.c:446]: xavp_destroy_list(): destroying xavp list (nil)
DEBUG: <core> [core/receive.c:368]: receive_msg(): cleaning up
``` 

If I remove the IPv6 range from the `is_in_subnet` function, things work normally.

Prior to today's upgrade, I was using 4.4.5 with updates from the 4.4 branch applied to the build (up to an including 4180f5b).

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