Updating proxy-stc to use basename of test tar

Change-Id: I786d788196413c5c57e8ce42ad631bfd8554b217
diff --git a/bucklets/onos.bucklet b/bucklets/onos.bucklet
index 38c3dd5..f6f7e9b 100644
--- a/bucklets/onos.bucklet
+++ b/bucklets/onos.bucklet
@@ -313,7 +313,7 @@
    ):
 
    cmd = ( 'mkdir -p $TMP/%(root_dir)s && '
-           'cp -r $SRCDIR/ $TMP/%(root_dir)s && '
+           'cp -r -L $SRCDIR/* $TMP/%(root_dir)s && '
            'tar -C $TMP -zcf $OUT %(root_dir)s' ) % {
            'root_dir': root if root is not None else name
          }