Modernize ATC list format

* tools/atc/README: When generating the initial data dump, MySQL on
review.openstack.org creates output files with DOS line endings and
ISO-8859-1 encoding. Recommend using fromdos and iconv to normalize
them.

Change-Id: Ie16a56c024b0eee97b0e6bd5abe8ed3b0e0a9f7e
Merge "Modernize ATC list format"