update hwaddr to fill in xx at create time Commit 67702c21 regressed the case where lxc-create use a config file with 'xx:xx' in lxc.network.hwaddr, so that the 'xx' were preserved in the container's configuration file. Expand those in the unexpanded_config file whenever we are reading a config file which is not coming from a 'lxc.include'. The config file will have \n-terminated lines, so update rand_complete_hwaddr to also stop on \n. Add a test case to make sure xx gets expanded at lxc-create. Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Acked-by: Stéphane Graber <stgraber@ubuntu.com>