Cloning/initializing svn repositories with an uncanonicalize url
does not work as libsvn throws an assertion. This patch
canonicalize svn uris for the clone and init command from
git-svn.
[ew: fixed trailing whitespace]
Signed-off-by: Ulrich Dangel <uli@spamt.net> Acked-by: Eric Wong <normalperson@yhbt.net>