[sr-dev] [kamailio/kamailio] 5.1.2: rtpengine module hijacks DTLS key (#1468)

[aalba6675]

### Description

rtpengine module is hijacking the DTLS key

rtpengine_manage("DTLS=off")

DTLS=off is a valid command to rtpengine, but the module uses that flag
to set transport as UDP/TLS/RTP/SAVP

Unfortunately even though the transport can be fixed by RTP/SAVP, the lines outputted by rtpengine

a=setup:actpass
a=fingerprint:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

confuse some UACs that were expecting only SDES. FreeSWITCH is affected.

### Troubleshooting


#### Reproduction

rtpengine_manage("DTLS=off"). tcpdump the traffic between kamailio and rtpengine.
Obseve that there is no DTLS=off key.

#### Debugging Data


#### Log Messages


#### SIP Traffic


### Possible Solutions

Don't look for DTLS key, let that be passthrough to kamailio

### Additional Information

5.1.2

* **Operating System**:
Linux CentOS 7.4

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https://github.com/kamailio/kamailio/issues/1468
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