Make test-convert-mtn pass on systems where mtn add -R uses different order

tests/test-convert-mtn

@@ -63,7 +63,7 b' mkdir dir2/dir'
 mkdir dir2/dir/subdir
 echo f > dir2/dir/subdir/f
 mkdir dir2/dir/emptydir
-mtn add -R dir2/dir
+mtn add --quiet -R dir2/dir
 mtn ci -m emptydir
 mtn drop -R dir2/dir
 mtn ci -m dropdirectory

tests/test-convert-mtn.out

@@ -29,10 +29,6 b' mtn: committed revision 6c6977a6ef609ec8'
 mtn: renaming dir to dir2 in workspace manifest
 mtn: beginning commit on branch 'com.selenic.test'
 mtn: committed revision 5de5abe7c15eae70cf3acdda23c9c319ea50c1af
-mtn: adding dir2/dir to workspace manifest
-mtn: adding dir2/dir/emptydir to workspace manifest
-mtn: adding dir2/dir/subdir to workspace manifest
-mtn: adding dir2/dir/subdir/f to workspace manifest
 mtn: beginning commit on branch 'com.selenic.test'
 mtn: committed revision 27a423be1e406595cc57f50f42a8790fa0a93d8e
 mtn: dropping dir2/dir/subdir/f from workspace manifest