git-svn: make test for SVK mirror path import

A manual test that sets up a repository that looks like an SVK depot,
and then imports it to check that it looks like we mirrored the
'original' source.

There is also a minor modification to the git-svn test library shell
file which sets a variable for the subversion repository's filesystem
path.

[ew: made some of the tests stricter and more thorough]

Signed-off-by: Eric Wong <normalperson@yhbt.net>

t/lib-git-svn.sh

@@ -42,9 +42,9 @@ then
 	exit
 fi
 
+rawsvnrepo="$svnrepo"
 svnrepo="file://$svnrepo"
 
-
 poke() {
 	perl -e '@x = stat($ARGV[0]); utime($x[8], $x[9] + 1, $ARGV[0])' "$1"
 }