Re-enable spacewalk mech, and other changes#1

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unreality wants to merge 1 commit intodavidnutter:masterfrom unreality:master

+87-12

Commits on Feb 21, 2012

re-enabled 'spacewalk' search mechanism, generate sha256sums for packages if needed for matching, small fix for mail-archive.com errata source, no longer require 'centos-errata.cfg' if -c is specif…
Raal Goff
committed