Unconfigure the devstack CA when USE_SSL is True

Change-Id: I17cb5e5d93bfe6fc6746ee530f639e2ed42da85a
diff --git a/unstack.sh b/unstack.sh
index bc439e9..4364e58 100755
--- a/unstack.sh
+++ b/unstack.sh
@@ -132,6 +132,9 @@
     stop_tls_proxy
     cleanup_CA
 fi
+if [ "$USE_SSL" == "True" ]; then
+    cleanup_CA
+fi
 
 SCSI_PERSIST_DIR=$CINDER_STATE_PATH/volumes/*