Run sidecars for csi-mock as privileged

The driver and provisioner runs as privileged, so make all the other
sidecar containers privileged too.

This helps on system with SELinux, non-privileged container can't access
socket of a privileged one.

test/e2e/testing-manifests/storage-csi/mock/csi-mock-cluster-driver-registrar.yaml

@@ -24,6 +24,8 @@ spec:
             - name: ADDRESS
               value: /csi/csi.sock
           imagePullPolicy: Always
+          securityContext:
+            privileged: true
           volumeMounts:
           - mountPath: /csi
             name: socket-dir

test/e2e/testing-manifests/storage-csi/mock/csi-mock-driver-attacher.yaml

@@ -23,6 +23,8 @@ spec:
             - name: ADDRESS
               value: /csi/csi.sock
           imagePullPolicy: Always
+          securityContext:
+            privileged: true
           volumeMounts:
           - mountPath: /csi
             name: socket-dir

test/e2e/testing-manifests/storage-csi/mock/csi-mock-driver-resizer.yaml

@@ -23,6 +23,8 @@ spec:
             - name: ADDRESS
               value: /csi/csi.sock
           imagePullPolicy: Always
+          securityContext:
+            privileged: true
           volumeMounts:
           - mountPath: /csi
             name: socket-dir