[Yum] PATCH: handle more checksum in repomd file

[Miroslav Suchý]

During the work on Spacewalk I tried to create repomd.xml file with more 
checksums in that file. See:
  https://www.redhat.com/archives/spacewalk-devel/2009-June/msg00021.html
for more info. But it's safe to skip.

But it takes only few moments that I find in yum code, that yum will 
pickup only last checksum it will find... :(

So I created patch for yum which will pickup only checksums, which are 
known to yum.

See attachment.
Can you please review it and if find appropriate, merge to git?

I tested it only on repomd.xml, but would like to have the same 
functionality on filelists.xml.gz, other.xml.gz, primary.xml.gz.
I did not try to fiddle with those tree yet. Does repoMDObject.py parse 
those file too. Or some other file does that job, can you give me pointers?

-- 
Miroslav Suchy
Red Hat Satellite Engineering
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