[sr-dev] [kamailio/kamailio] Error when parsing P-Asserted-Identity use $ai variable (#2837)

[MikhailKalashnikov]

### Description

According to RFC 3261 part `7.3.1 Header Field Format` header fields values can be extended over multiple lines separated with tab (`\r\n\t`).
It seems that for many headers Kamailio support this format, but for `P-Asserted-Identity` if I try to use variable `$ai` I get error and null value

```
ERROR: |1232432423|<core> [core/parser/parse_addr_spec.c:662]: parse_addr_spec(): unexpected char [] in status 0: [] .
ERROR: |1232432423|<core> [core/parser/parse_ppi_pai.c:71]: parse_pai_ppi_body(): Error parsing PAI/PPI body 1 '<sip:+70000000000 at test.com>,
      <tel:+79211119987>'
```

I attach example of pcap. [pai.zip](https://github.com/kamailio/kamailio/files/7071411/pai.zip)

And below quotes from RFC 3261
```
Header fields can be extended over multiple lines by preceding each extra line with at least one SP or horizontal tab (HT)
....
Route: <sip:alice at atlanta.com>, <sip:bob at biloxi.com>,
       <sip:carol at chicago.com>

```

### Additional Information

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

```
version: kamailio 5.4.0 (x86_64/linux) 6c4fce
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: 6c4fce 
compiled on 17:15:32 Jul 29 2020 with gcc 4.8.5

```

* **Operating System**:

```
CentOS Linux release 7.8.2003
```


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