[sr-dev] [kamailio/kamailio] [stirshaken] add identity header in reply messages or to a separate variable (#2770)

[sergei lavrov]

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### Description

I'm unable to add the generated `Identity` value to reply message when `kamailio` acts as a redirect server and replies with `302 Moved Temporarily` instead of relaying `INVITE`.
This code doesn't work, i.e. no `Identity` header in `302 Moved Temporarily` message:
```
if (stirshaken_add_identity($var(x5u), $var(attest), $var(origtn_val), $var(desttn_val), $var(origid)) == 1)
{
	append_branch("sip:$rU at 127.0.0.1:6060");
	sl_send_reply("302", "Moved Temporarily");
	exit;
}
```

### Expected behavior

It would be nice if the `stirshaken_add_identity_*` functions would add the generated `Identity` header to the reply messages too, or store the generated `Identity` header in a separate variable, like `$identity`, for the future processing.



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https://github.com/kamailio/kamailio/issues/2770
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