branch: improve advice when --recurse-submodules fails

'git branch --recurse-submodules start from-here' fails if any submodule
present in 'from-here' is not yet cloned (under
submodule.propagateBranches=true). We then give this advice:

   "You may try updating the submodules using 'git checkout from-here && git submodule update --init'"

If 'submodule.recurse' is set, 'git checkout from-here' will also fail since
it will try to recursively checkout the submodules.

Improve the advice by adding '--no-recurse-submodules' to the checkout
command.

Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
Reviewed-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

branch.c

@@ -756,7 +756,7 @@ void create_branches_recursively(struct repository *r, const char *name,
 				_("submodule '%s': unable to find submodule"),
 				submodule_entry_list.entries[i].submodule->name);
 			if (advice_enabled(ADVICE_SUBMODULES_NOT_UPDATED))
-				advise(_("You may try updating the submodules using 'git checkout %s && git submodule update --init'"),
+				advise(_("You may try updating the submodules using 'git checkout --no-recurse-submodules %s && git submodule update --init'"),
 				       start_commitish);
 			exit(code);
 		}