Some improvements to release tools

Change-Id: I651866d746a1e661fcefe0b28ef1e8e57cd502e9
diff --git a/tools/build/onos-upload-docs b/tools/build/onos-upload-docs
index 18985e8..f498358 100755
--- a/tools/build/onos-upload-docs
+++ b/tools/build/onos-upload-docs
@@ -8,7 +8,7 @@
 [ ! -d "$ONOS_ROOT" ] && echo "ONOS_ROOT is not defined" >&2 && exit 1
 . $ONOS_ROOT/tools/build/envDefaults
 
-user=${1:-$USER}
+user=${1:-${WIKI_USER:-$USER}}
 remote=$user@wiki.onosproject.org
 
 scp $ONOS_ROOT/docs/target/onos-apidocs-$ONOS_VERSION.tar.gz $remote:/tmp