ONOS-487: Allow ONOS to be installed using different user/group

Change-Id: Ica926a2a6e0870e3aeab1e1585073196358c8184
diff --git a/tools/test/bin/onos-install b/tools/test/bin/onos-install
index 4bc41a4..4cb78eb 100755
--- a/tools/test/bin/onos-install
+++ b/tools/test/bin/onos-install
@@ -27,7 +27,7 @@
     [ -d $ONOS_INSTALL_DIR/bin ] && echo \"ONOS is already installed\" && exit 1
 
     # Prepare a landing zone and unroll the bits
-    sudo mkdir -p $ONOS_INSTALL_DIR && sudo chown ${ONOS_USER}:${ONOS_USER} $ONOS_INSTALL_DIR
+    sudo mkdir -p $ONOS_INSTALL_DIR && sudo chown ${ONOS_USER}:${ONOS_GROUP} $ONOS_INSTALL_DIR
     tar zxmf /tmp/$ONOS_BITS.tar.gz -C $ONOS_INSTALL_DIR --strip-components=1
 
     # Make a link to the log file directory and make a home for auxiliaries