Do not change Gerrit files ownership

The Gerrit volumes mounted externally do not allow changing files
ownership from the container and therefore would result in the
failure of the container.

It was originally working but it isn't supported anymore
from Docker 2.4.x onwards.

Bug: Issue 13822
Change-Id: Ie27524cb834e67b1729cb4c600e47d6010043f85

src/test/docker/gerrit/start.sh

diff --git a/src/test/docker/gerrit/start.sh b/src/test/docker/gerrit/start.sh
index 65804b3..0dae4c3 100755
--- a/src/test/docker/gerrit/start.sh
+++ b/src/test/docker/gerrit/start.sh
@@ -5,8 +5,6 @@
   wait-for-it.sh $WAIT_FOR -t 600 -- echo "$WAIT_FOR is up"
 fi
 
-chown -R gerrit: /var/gerrit
-
 sudo -u gerrit cp /var/gerrit/etc/gerrit.config.orig /var/gerrit/etc/gerrit.config
 sudo -u gerrit cp /var/gerrit/etc/high-availability.config.orig /var/gerrit/etc/high-availability.config