[sr-dev] [kamailio/kamailio] rfc5952#section-4.3 conformance: IPv6 address in lower case (#2488)

[sergey-safarov]

### Description
[rfc5952#section-4.3](https://tools.ietf.org/html/rfc5952#section-4.3)

> **4.3.  Lowercase**
   The characters "a", "b", "c", "d", "e", and "f" in an IPv6 address
   MUST be represented in lowercase.

### Expected behavior
According to RFC

#### Actual observed behavior
IPv6 addresses the upper case.

#### Debugging Data
None

#### Log Messages
None

#### SIP Traffic

```
OPTIONS sip:proxy.example.com;transport=tcp SIP/2.0
Via: SIP/2.0/TCP [2600:1F1C:257:8706:C6BA:A565:1E85:B29E];branch=z9hG4bKa3e9.cac3f2f1000000000000000000000000.0
To: <sip:proxy.example.com;transport=tcp>
From: <sip:proxy at example.com>;tag=897804205b5fb4c6a22d7dcb9cb796fb-733ff025
CSeq: 10 OPTIONS
Call-ID: 29ea7b443fbf87f8-2892 at 172.22.6.119
Max-Forwards: 70
Content-Length: 0
User-Agent: Kamailio
```

### Possible Solutions

Not known

### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
[centos at ip-172-22-6-226 ~]$ kamailio -v
version: kamailio 5.5.0-dev2 (x86_64/linux) 60f04b
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, TLS_PTHREAD_MUTEX_SHARED
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: 60f04b 
compiled on 04:01:18 Sep 26 2020 with gcc 8.3.1
```

* **Operating System**:

```
[centos at ip-172-22-6-226 ~]$ cat /etc/os-release 
NAME="CentOS Linux"
VERSION="8 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="8"
```


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