t9010 (svn-fe): Eliminate dependency on svn perl bindings

Running test t9010 without the SVN:: perl modules currently errors
out, for no good reason.  We can make these tests easier to read and
run by not using the perl libsvn bindings and instead duplicating only
the relevant code from lib-git-svn.sh.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9010-svn-fe.sh

@@ -2,7 +2,17 @@
 
 test_description='check svn dumpfile importer'
 
-. ./lib-git-svn.sh
+. ./test-lib.sh
+
+svnconf=$PWD/svnconf
+export svnconf
+
+svn_cmd () {
+	subcommand=$1 &&
+	shift &&
+	mkdir -p "$svnconf" &&
+	svn "$subcommand" --config-dir "$svnconf" "$@"
+}
 
 test_dump () {
 	label=$1