Remove n-obj from zuul and docs

n-obj hasn't been around for many years and devstack
doesn't use it anymore anyway so this just cleans up
some vestigial use of the old service.

Change-Id: I04b2d2dc2b4e49fab90f5ef94f4e087e969aa24b

Author: mriedem

.zuul.yaml

@@ -412,7 +412,6 @@
         n-cond: true
         n-cpu: true
         n-novnc: true
-        n-obj: true
         n-sch: true
         placement-api: true
         # Neutron services

doc/source/guides/devstack-with-lbaas-v2.rst

@@ -59,7 +59,7 @@ Edit your ``/opt/stack/devstack/local.conf`` to look like
     # Horizon - enable for the OpenStack web GUI
     # ENABLED_SERVICES+=,horizon
     # Nova
-    ENABLED_SERVICES+=,n-api,n-crt,n-obj,n-cpu,n-cond,n-sch,n-api-meta,n-sproxy
+    ENABLED_SERVICES+=,n-api,n-crt,n-cpu,n-cond,n-sch,n-api-meta,n-sproxy
     ENABLED_SERVICES+=,placement-api,placement-client
     # Glance
     ENABLED_SERVICES+=,g-api,g-reg