Previously, if a user provided a custom neutron ML2 configuration file in /home/stackhpc-mark/kayobe/src/kayobe-config/etc/kayobe/neutron/ml2_conf.ini, it would overwrite the options set by kayobe. This change applies the 'ignore' rule when copying custom config files, as well as when deleting them. This works because we read in the contents of these files and append it to kayobe's own configuration.