merge-submodule: reduce output verbosity

The output shall behave more similar to ordinary file merges' output to provide
a more consistent user experience.

Signed-off-by: Leif Middelschulte <Leif.Middelschulte@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

merge-recursive.c

@@ -1097,7 +1097,7 @@ static int merge_submodule(struct merge_options *o,
 			output(o, 3, _("Fast-forwarding submodule %s to the following commit:"), path);
 			output_commit_title(o, commit_b);
 		} else if (show(o, 2))
-			output(o, 2, _("Fast-forwarding submodule %s to %s"), path, oid_to_hex(b));
+			output(o, 2, _("Fast-forwarding submodule %s"), path);
 		else
 			; /* no output */
@@ -1109,7 +1109,7 @@ static int merge_submodule(struct merge_options *o,
 			output(o, 3, _("Fast-forwarding submodule %s to the following commit:"), path);
 			output_commit_title(o, commit_a);
 		} else if (show(o, 2))
-			output(o, 2, _("Fast-forwarding submodule %s to %s"), path, oid_to_hex(a));
+			output(o, 2, _("Fast-forwarding submodule %s"), path);
 		else
 			; /* no output */