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

Change-Id: Ica926a2a6e0870e3aeab1e1585073196358c8184
diff --git a/tools/build/envDefaults b/tools/build/envDefaults
index 81405d8..a7eb8bf 100644
--- a/tools/build/envDefaults
+++ b/tools/build/envDefaults
@@ -33,4 +33,5 @@
 export ONOS_INSTALL_DIR="/opt/onos"     # Installation directory on remote
 export OCI="${OCI:-}"     # ONOS Controller Instance
 export ONOS_USER="${ONOS_USER:-sdn}"    # ONOS user on remote system
+export ONOS_GROUP="${ONOS_GROUP:-sdn}"  # ONOS group on remote system
 export ONOS_PWD="rocks"                 # ONOS user password on remote system