migrated the content of rpmkit.yum_makelistcache._init_yum_base into rpmkit.yum_makelistcache.yum_list
shorten too long line in rpmkit.yum_makelistcache
dce in rpmkit.yum_surrogate
fix a bug that rpmkit.yum_surrogate.run_yum_cmd calling wrong function
switch from rpmkit.yum_surrogate.list_errata_g (fragile) to rpmkit.yum_makelistcache.yum_list_errata (more robust and used in production system) in rpmkit.extras.updateinfo.fetch_and_dump_errata_summary