etl: removed unneeded chown that causes error on service actions

The PID file is already created with the correct permissions, so
this chown can be removed. If dwh is stopped a error arises due
to PID file not created yet.

Change-Id: I5a16c47c36fccd177db607f5c64a69c0799912fa
Signed-off-by: Yaniv Dary <ydary@redhat.com>