az ssh vm problem with Portal ssh configuration reset

- If the issue is to do with Azure CLI 2.0 in-particular, create an issue here at [Azure/azure-cli](https://github.com/Azure/azure-cli/issues)

### Related command

az ssh vm -n myVM -g dev

### Extension name (the extension in question)
ssh

### Description of issue (in as much detail as possible)

-----

A coleague was having problem accessing a Linux VM with az cli plugin, although I could access the VM by both azure cli and my host ssh (using manually added ssh pub key on VM on "ubuntu" user) I followed this [troubleshooting](https://docs.microsoft.com/en-us/troubleshoot/azure/virtual-machines/troubleshoot-ssh-connection#use-the-azure-cli) and I reset the VM SSH configuration in Azure Portal (Virtual Machines -> select the VM in question -> Reset password -> "Reset configuration only" -> Update). After that no one was capable to access the VM with `az ssh vm` anymore.

I then run the ssh extension with the debug option and could check that everything was working fine at the AD authentication with Azure and the temporary certificate generation. The problem was when trying to ssh the VM with the temporary ssh certificate created.

I then checked the `/var/log/auth.log` on remote and it was printing the following:
```
Aug 24 18:29:02 influx-test sshd[2756]: rexec line 18: Deprecated option UsePrivilegeSeparation
Aug 24 18:29:02 influx-test sshd[2756]: rexec line 21: Deprecated option KeyRegenerationInterval
Aug 24 18:29:02 influx-test sshd[2756]: rexec line 22: Deprecated option ServerKeyBits
Aug 24 18:29:02 influx-test sshd[2756]: rexec line 33: Deprecated option RSAAuthentication
Aug 24 18:29:02 influx-test sshd[2756]: rexec line 41: Deprecated option RhostsRSAAuthentication
Aug 24 18:29:03 influx-test sshd[2756]: reprocess config line 33: Deprecated option RSAAuthentication
Aug 24 18:29:03 influx-test sshd[2756]: reprocess config line 41: Deprecated option RhostsRSAAuthentication
Aug 24 18:29:04 influx-test sshd[2756]: Connection closed by authenticating user rodrigo.brochado@predito.com.br 192.140.41.80 port 51525 [preauth]
Aug 24 18:29:06 influx-test sshd[2760]: rexec line 18: Deprecated option UsePrivilegeSeparation
Aug 24 18:29:06 influx-test sshd[2760]: rexec line 21: Deprecated option KeyRegenerationInterval
Aug 24 18:29:06 influx-test sshd[2760]: rexec line 22: Deprecated option ServerKeyBits
Aug 24 18:29:06 influx-test sshd[2760]: rexec line 33: Deprecated option RSAAuthentication
Aug 24 18:29:06 influx-test sshd[2760]: rexec line 41: Deprecated option RhostsRSAAuthentication
Aug 24 18:29:06 influx-test sshd[2760]: error: kex_exchange_identification: Connection closed by remote host
```

I figured that the SSH configuration reset broke something and was probably not accepting the type of temporary key generated by `az ssh`. I found a backup file for /etc/ssh/sshd_config on the same /etc/ssh/ folder and restore it. Reload the `sshd` service and `az ssh vm` login was working again. I later found that my colleague was having internet problems.

My questions are:
1) Shouldn't `az ssh` extension report that the remote ssh server is rejecting the connection with certificates, even more if we are using the `az ssh vm` with "AAD issued certificates" option?
2) How could I report this bug of the "Reset SSH Configuration" in Azure Portal?

The [correct_config.txt](https://github.com/Azure/azure-cli-extensions/files/9419342/correct_config.txt)
and [bugged_config.txt](https://github.com/Azure/azure-cli-extensions/files/9419341/bugged_config.txt) sshd_config files.