[sr-dev] [kamailio/kamailio] is_first_hop() not processing FQDN in RR header in a case of reply (#2732)

[Igor Olhovskiy]

### Description

In the case of using FQDN in 
`listen = ... advertise ... `
FQDN is populated in the `Record-Route` header. In this case `is_first_hop()` function is not returning true even if `FQDN == myself` in replies.

#### Reproduction

Add FQND in advertise and check `is_first_hop()` result in a case of reply

#### Log Messages

```
siputils [sipops.c:185]: is_first_hop(): uri host is not an ip address
```

### Possible Solutions

Not use `is_first_hop()` in the case of reply/FQDN in advertising.

### Additional Information

version: kamailio 5.4.4 (x86_64/linux) e16352
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: e16352 
compiled on 09:50:10 May  7 2021 with gcc 4.8.5


* **Operating System**:

```
# uname -a
Linux fe-0513-2-dev 3.10.0-1160.21.1.el7.x86_64 #1 SMP Tue Mar 16 18:28:22 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

```
https://github.com/kamailio/kamailio/blob/02240711239149e2f5c4890a70ab158d10fa8187/src/modules/siputils/sipops.c#L183

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