Add iBGP workflow and LibreNMS client

@Aleksandr.Kurbatov We will need to test this together to verify that no info is missing for the Ansible playbooks I've added Simone as a reviewer just to keep him in the loop.

gso/services/librenms_client.py

@@ -98,12 +98,15 @@ class LibreNMSClient:
         :return list[str]: A list of errors, if empty the device is successfully validated.
         """
         errors = []
-        device = self.get_device(fqdn)
-
-        if device["status"] != "ok":
-            errors += ["Device does not exist in LibreNMS."]
+        try:
+            device = self.get_device(fqdn)
 
-        if device["hostname"] != fqdn:
-            errors += ["Device hostname in LibreNMS does not match FQDN."]
+            if device["devices"][0]["hostname"] != fqdn:
+                errors += ["Device hostname in LibreNMS does not match FQDN."]
+        except HTTPError as e:
+            if e.response.status_code == HTTPStatus.NOT_FOUND:
+                errors += ["Device does not exist in LibreNMS."]
+            else:
+                raise
 
         return errors