Adding the new login URL of NSO 5.7.5.1

[Mathias-gt]

In version 5.7.5.1 of NSO, the login URL "http://NSO_IP:8080/api" is no longer available.
The new login URL is "http://NSO_IP:8080/restconf".

I submitted a pull request 3 years ago to make it compatible with both login URLs, and I see it is still waiting to be merged.
Could someone look into it, please?

🔗 Pull Request #95