Howto for conversion (WIP)
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1/ On alioth generate the AUTHORS.txt lists via fetch-authors script.

2/ Clone the subversion repository using git-svn:

 $ git svn clone svn+ssh://svn.debian.org/svn/secure-testing --prefix=origin/ -no-metadata -A AUTHORS.txt tmp-git-repo

3/ Push repository to new bare git repo

 $ cd tmp-git-repo
 $ git remote add new-repo git+ssh://git.debian.org/git/debian-security/debian-security.git
 $ git config remote.new-repo.push 'refs/remotes/*:refs/heads/*'
 $ git push --new-upstream new-repo master