Remove /var/cache/cinder emptyDir volume

This patch removes unused `/var/cache/cinder` volume that is mounted for
each of Cinder services. I suppose it was added to serve as value of
`signing_dir` option from keystonemiddleware and is used to cache PKI
tokens. We're however never setting the option to that value and the
option was deprecated in Ocata, so we should be fine to remove it.

In case someone still wanted to use `signing_dir` config option, he can
easily confiure it back using config and volumes overrides.

Related-Bug: 1702072

Change-Id: I03460151e01293b19a864528561c80cab1a72114

cinder/templates/deployment-api.yaml

@@ -74,8 +74,6 @@ spec:
             tcpSocket:
               port: {{ .Values.conf.cinder.default.cinder.osapi_volume_listen_port }}
           volumeMounts:
-            - name: pod-var-cache-cinder
-              mountPath: /var/cache/cinder
             - name: cinder-bin
               mountPath: /tmp/cinder-api.sh
               subPath: cinder-api.sh
@@ -94,8 +92,6 @@ spec:
               readOnly: true
 {{ if $mounts_cinder_api.volumeMounts }}{{ toYaml $mounts_cinder_api.volumeMounts | indent 12 }}{{ end }}
       volumes:
-        - name: pod-var-cache-cinder
-          emptyDir: {}
         - name: cinder-bin
           configMap:
             name: cinder-bin

cinder/templates/deployment-backup.yaml

@@ -77,8 +77,6 @@ spec:
           command:
             - /tmp/cinder-backup.sh
           volumeMounts:
-            - name: pod-var-cache-cinder
-              mountPath: /var/cache/cinder
             - name: cinder-bin
               mountPath: /tmp/cinder-backup.sh
               subPath: cinder-backup.sh
@@ -101,8 +99,6 @@ spec:
             {{- end -}}
 {{ if $mounts_cinder_backup.volumeMounts }}{{ toYaml $mounts_cinder_backup.volumeMounts | indent 12 }}{{ end }}
       volumes:
-        - name: pod-var-cache-cinder
-          emptyDir: {}
         - name: cinder-etc
           configMap:
             name: cinder-etc

cinder/templates/deployment-scheduler.yaml

@@ -60,8 +60,6 @@ spec:
           command:
             - /tmp/cinder-scheduler.sh
           volumeMounts:
-            - name: pod-var-cache-cinder
-              mountPath: /var/cache/cinder
             - name: cinder-bin
               mountPath: /tmp/cinder-scheduler.sh
               subPath: cinder-scheduler.sh
@@ -80,8 +78,6 @@ spec:
               readOnly: true
 {{ if $mounts_cinder_scheduler.volumeMounts }}{{ toYaml $mounts_cinder_scheduler.volumeMounts | indent 12 }}{{ end }}
       volumes:
-        - name: pod-var-cache-cinder
-          emptyDir: {}
         - name: cinder-bin
           configMap:
             name: cinder-bin

cinder/templates/deployment-volume.yaml

@@ -77,8 +77,6 @@ spec:
           command:
             - /tmp/cinder-volume.sh
           volumeMounts:
-            - name: pod-var-cache-cinder
-              mountPath: /var/cache/cinder
             - name: cinder-bin
               mountPath: /tmp/cinder-volume.sh
               subPath: cinder-volume.sh
@@ -105,8 +103,6 @@ spec:
             {{- end }}
 {{ if $mounts_cinder_volume.volumeMounts }}{{ toYaml $mounts_cinder_volume.volumeMounts | indent 12 }}{{ end }}
       volumes:
-        - name: pod-var-cache-cinder
-          emptyDir: {}
         - name: cinder-bin
           configMap:
             name: cinder-bin