git-svn testsuite: use standard configuration for Subversion tools

I have tweaked configuration in my ~/.subversion directory, namely I am
running auto-properties and automatically adding '$Id$' expansion to
every file.  This choke the last test named 'proplist' from
t9101-git-svn-props.sh, because one more property, svn:keywords is
automatically added.

I had just wrapped svn invocation with the svn_cmd that specifies empty
directory via --config-dir argument.  Since the latter is the global
option, it should be recognized by all svn subcommands, so no
regressions will be introduced.

Now svn_cmd is used everywhere, not just in the failed test module: this
should guard us from the future clashes with user-defined configuration
tweaks.

Signed-off-by: Eygene Ryabinkin <rea-git@codelabs.ru>
Acked-by: Eric Wong <normalperson@yhbt.net>
diff --git a/t/t9128-git-svn-cmd-branch.sh b/t/t9128-git-svn-cmd-branch.sh
index 252daa7..807e494 100755
--- a/t/t9128-git-svn-cmd-branch.sh
+++ b/t/t9128-git-svn-cmd-branch.sh
@@ -14,13 +14,13 @@
 		cd trunk &&
 		echo foo > foo &&
 		cd .. &&
-		svn import -m "import for git-svn" . "$svnrepo" >/dev/null &&
+		svn_cmd import -m "import for git-svn" . "$svnrepo" >/dev/null &&
 		cd .. &&
 		rm -rf import &&
-		svn co "$svnrepo"/trunk trunk &&
+		svn_cmd co "$svnrepo"/trunk trunk &&
 		cd trunk &&
 		echo bar >> foo &&
-		svn ci -m "updated trunk" &&
+		svn_cmd ci -m "updated trunk" &&
 		cd .. &&
 		rm -rf trunk
 	)
@@ -57,14 +57,14 @@
 '
 
 test_expect_success 'branch uses correct svn-remote' '
-	(svn co "$svnrepo" svn &&
+	(svn_cmd co "$svnrepo" svn &&
 	cd svn &&
 	mkdir mirror &&
-	svn add mirror &&
-	svn copy trunk mirror/ &&
-	svn copy tags mirror/ &&
-	svn copy branches mirror/ &&
-	svn ci -m "made mirror" ) &&
+	svn_cmd add mirror &&
+	svn_cmd copy trunk mirror/ &&
+	svn_cmd copy tags mirror/ &&
+	svn_cmd copy branches mirror/ &&
+	svn_cmd ci -m "made mirror" ) &&
 	rm -rf svn &&
 	git svn init -s -R mirror --prefix=mirror/ "$svnrepo"/mirror &&
 	git svn fetch -R mirror &&