tests: use "git foo" without dash in strings

This changes "git-foo" to "git foo" when message strings in tests
name git subcommands.

Signed-off-by: Nanako Shiraishi <nanako3@lavabit.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9123-git-svn-rebuild-with-rewriteroot.sh

@@ -10,7 +10,7 @@ test_description='git svn respects rewriteRoot during rebuild'
 mkdir import
 cd import
 	touch foo
-	svn import -m 'import for git-svn' . "$svnrepo" >/dev/null
+	svn import -m 'import for git svn' . "$svnrepo" >/dev/null
 cd ..
 rm -rf import