Add a Kentik service to GSO

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

gso/oss-params-example.json

@@ -119,7 +119,6 @@
     "bgp_type": "device",
     "bgp_lookup_strategy": "lu_global_fallback",
     "ASN": 137,
-    "route_selection": "both directions",
     "snmp_community": "secret community string",
     "md5_password": "snmp password"
   }