lorry: Avoid creating non-bare repository in gitify_svn

Our working repositories should always be initialised as bare, and
this should be done in one place.  gitify_svn currently uses "git svn
init", which always creates a non-bare repository, and then modifies
the repository to be bare (though still with core.logallrefupdates
enabled).

Thankfully "git svn init" does very little beyond "git init", so
we can avoid this:

1. Call ensure_gitdir, like other gitify methods do
2. Create the directory svn/refs/remotes/git-svn
3. Set config parameters svn-remote.svn.url (which we already did) and
   svn-remote.svn.fetch

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