read-tree: add t1013 for submodule updates
read-tree: add t1013 for submodule updates

Test that the read-tree command updates the work tree as expected for
changes which don't result in conflicts with the '-m' and '--reset' flag.

Signed-off-by: Jens Lehmann <3a81d01482cca860e4077eb409d7db78ebdc6f24@web.de>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git