Disable cinder services on neutron grenade jobs

We don't need it to test cinder in our jobs.
This patch disables Cinder in grenade jobs. If that will be ok
we can do the same for scenario jobs also.

This patch also enables br-ex-tcpdump and br-int-flows
services in the grenade jobs as it was missing there and
may be useful during debugging some failures of those jobs
in the future.

Change-Id: If490da1f7e695564a65cabf95f25c72f7639ae19

zuul.d/grenade.yaml

@@ -18,14 +18,26 @@
       - ^migration/.*$
     vars:
       devstack_services:
-        c-bak: false
         etcd: false
+        br-ex-tcpdump: true
+        br-int-flows: true
+        # Cinder services
+        c-api: false
+        c-bak: false
+        c-sch: false
+        c-vol: false
+        cinder: false
+        # Swift services
         s-account: false
         s-container: false
         s-object: false
         s-proxy: false
-        br-ex-tcpdump: true
-        br-int-flows: true
+    group-vars:
+      subnode:
+        devstack_services:
+          # Cinder services
+          c-bak: false
+          c-vol: false
 
 - job:
     name: neutron-grenade-dvr-multinode
@@ -39,14 +51,20 @@
     irrelevant-files: *irrelevant-files
     vars:
       devstack_services:
-        c-bak: false
         etcd: false
+        br-ex-tcpdump: true
+        br-int-flows: true
+        # Cinder services
+        c-api: false
+        c-bak: false
+        c-sch: false
+        c-vol: false
+        cinder: false
+        # Swift services
         s-account: false
         s-container: false
         s-object: false
         s-proxy: false
-        br-ex-tcpdump: true
-        br-int-flows: true
       devstack_local_conf:
         post-config:
           $NEUTRON_CONF:
@@ -82,6 +100,9 @@
           q-meta: true
           br-ex-tcpdump: true
           br-int-flows: true
+          # Cinder services
+          c-bak: false
+          c-vol: false
         devstack_local_conf:
           post-config:
             $NEUTRON_CONF:
@@ -155,7 +176,6 @@
       extensions_to_txt:
         db: true
       devstack_services:
-        c-bak: false
         etcd: false
         br-ex-tcpdump: true
         br-int-flows: true
@@ -173,6 +193,12 @@
         q-meta: false
         q-metering: false
         q-dns: true
+        # Cinder services
+        c-api: false
+        c-bak: false
+        c-sch: false
+        c-vol: false
+        cinder: false
         # When running python3 Swift should be disabled for now
         s-account: false
         s-container: false
@@ -200,6 +226,9 @@
           q-metering: false
           q-ovn-metadata-agent: true
           tls-proxy: false
+          # Cinder services
+          c-bak: false
+          c-vol: false
         grenade_devstack_localrc:
           old:
             Q_BUILD_OVS_FROM_GIT: true