test-convert-mtn: test descriptions with quotes

tests/test-convert-mtn

@@ -54,7 +54,7 b' echo e > e'
 mtn add e
 mtn drop dir/b
 mtn mv bin bin2
-mtn ci -m update2
+mtn ci -m 'update2 "with" quotes'
 # Test directory move
 mtn mv dir dir2
 mtn ci -m movedir

tests/test-convert-mtn.out

@@ -46,7 +46,7 b' assuming destination repo.mtn-hg'
 scanning source...
 sorting...
 converting...
-3 update2
+3 update2 "with" quotes
 2 movedir
 1 emptydir
 0 dropdirectory
@@ -57,7 +57,7 b' o 4 "emptydir" files: dir2/dir/subdir/f'
 |
 o  3 "movedir" files: dir/a dir2/a
 |
-o  2 "update2" files: bin bin2 dir/b e
+o  2 "update2 "with" quotes" files: bin bin2 dir/b e
 |
 o  1 "update1" files: a bin c dir/a dir/b
 |