git-svn: allow `info' command to work offline
Cache the repository root whenever we connect to the repository.
This will allow us to notice URL changes if the user changes the
URL in .git/config, too.
If the repository is no longer accessible, or if `git svn info'
is the first and only command run; then '(offline)' will be
displayed for "Repository Root:" in the output.
Signed-off-by: NEric Wong <normalperson@yhbt.net>
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