Add a Kentik service to GSO

Add and remove devices using Kentik, the router creation and termination workflows have been updated

gso/services/kentik_client.py

@@ -144,3 +144,8 @@ class KentikClient:
             self._send_request("DELETE", f"v5/device/{device_id}")
 
         self._send_request("DELETE", f"v5/device/{device_id}")
+
+    def remove_device_by_fqdn(self, fqdn: str, *, archive: bool = True) -> None:
+        """Remove a device from Kentik, by its :term:`FQDN`."""
+        device_id = self.get_device_by_name(fqdn)["id"]
+        self.remove_device(device_id, archive=archive)