Sliver implants don't work anymore

When attackmate generates an implant, the implant looks in sliver like:

```
Name Implant Type Template OS/Arch Format Command & Control Debug
============ ============== ========== ============= ============ ============================ =======
badimplant session sliver linux/amd64 EXECUTABLE [1] https://faaacebook.com false
```

The c2 should use the mtls-protocol. Manually generated implants look like following:

```
Name Implant Type Template OS/Arch Format Command & Control Debug
============= ============== ========== ============= ============ =============================== =======
GREEK_VELDT session sliver linux/amd64 EXECUTABLE [1] mtls://faaacebook.com:443 true
```

It's time to check the sliver-py api and check if the protobuf-schema changed in sliver and extend the options in a way, that mtls dns aso are useable too.