TOOLS-263: fix "upgrade" tarball build, no more "extra" dir in the boot tarball
TOOLS-263: fix "upgrade" tarball build, no more "extra" dir in the boot tarball

kaizengarden/sdc-headnode,joyent/sdc-headnode,numericillustration/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,kaizengarden/sdc-headnode,numericillustration/sdc-headnode,joyent/sdc-headnode,numericillustration/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode