Stop bower from reaching outside the sandbox

Change-Id: Ie55f247a7f8e994c4422b0db512e5436e01d1585
diff --git a/web/gui/BUILD b/web/gui/BUILD
index 3a2bfcc..8cca7b9 100644
--- a/web/gui/BUILD
+++ b/web/gui/BUILD
@@ -119,7 +119,9 @@
     outs = ["onos-gui-npm-install.tar"],
     cmd = " ROOT=`pwd` &&" +
           " export XDG_CONFIG_HOME=$(@D)/config &&" +  # npm config cache to the sandbos
-          " export BABEL_DISABLE_CACHE=1" +  # turn off babel cache
+          " export BABEL_DISABLE_CACHE=1 &&" +  # turn off babel cache
+          " export bower_storage__packages=.bower &&" +
+          " export bower_storage__registry=.bower &&" +
           " NPM=$$ROOT/$(location @nodejs//:bin/npm) &&" +
           " mkdir -p tools/gui &&" +
           " cd tools/gui &&" +
@@ -144,6 +146,8 @@
     cmd = "(ROOT=`pwd` &&" +
           " export XDG_CONFIG_HOME=$(@D)/config &&" +
           " export BABEL_DISABLE_CACHE=1" +
+          " export bower_storage__packages=.bower &&" +
+          " export bower_storage__registry=.bower &&" +
           " NPM=$(location @nodejs//:bin/npm) &&" +
           " (mkdir -p web/gui && cd web/gui && tar xf ../../$(location :_web_app_all)) &&" +
           " mkdir -p tools/gui && cd tools/gui &&" +