Merge "Docker run scripts with sh which doesn't support [["

docker/neutron/neutron-server/Dockerfile.j2

@@ -4,7 +4,7 @@ MAINTAINER {{ maintainer }}
 ADD plugins-archive /
 COPY extend_start.sh /usr/local/bin/kolla_extend_start
 RUN chmod 755 /usr/local/bin/kolla_extend_start \
-    && if [[ "$(ls /plugins)" ]]; then \
+    && if [ "$(ls /plugins)" ]; then \
            pip --no-cache-dir install --upgrade -c requirements/upper-constraints.txt /plugins/*; \
        fi