[sr-dev] [kamailio/kamailio] dialog module does not update callee tag until 2xx received (Issue #3155)

[patrickarton]

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### Description
dialog module does not update callee tag until it receives a 2xx response to an INVITE.
and so we can not use is_know_dlg() function for in-dialog request like UPDATE when the session is still in early state.
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### Troubleshooting

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### Additional Information

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

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kamailio 5.5.4
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* **Operating System**:

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