Projects/MockTodo

Mock Todo/idea list

 * remove the comps.xml dependence
 * make it use a package for the list of deps
 * make it use a flat file of pkgs-per-profile (minimal, base, build)
 * cache packages/installed environments
 * mock 'chroot' command to switch into the environment
 * fix find-files bug - see
 * Add a config_opts['default_macros'] which contains base mock macros like _topdir and _rpmfilename, which a specific mock .cfg can append to it's own config_opts['macros'] .  'macros' defined by a .cfg file currently _replace_ those in mock.py completely.