netbox_cable: Fix idempotency (#990)

Fixes #989

Author: jof

plugins/module_utils/netbox_utils.py

@@ -70,6 +70,7 @@
         "rack_groups",
         "rack_roles",
         "rear_ports",
+        "rear-ports",
         "rear_port_templates",
         "regions",
         "sites",
@@ -348,6 +349,7 @@
     "rack_groups": "rack_group",
     "rack_roles": "rack_role",
     "rear_ports": "rear_port",
+    "rear-ports": "rearport",
     "rear_port_templates": "rear_port_template",
     "regions": "region",
     "rirs": "rir",