Merge branch 'jt/submodule-fetch-errmsg'

Error message update.

* jt/submodule-fetch-errmsg:
  submodule: explain first attempt failure clearly

git-submodule.sh

@@ -594,7 +594,7 @@ cmd_update()
 				# is not reachable from a ref.
 				is_tip_reachable "$sm_path" "$sha1" ||
 				fetch_in_submodule "$sm_path" $depth ||
-				say "$(eval_gettext "Unable to fetch in submodule path '\$displaypath'")"
+				say "$(eval_gettext "Unable to fetch in submodule path '\$displaypath'; trying to directly fetch \$sha1:")"
 
 				# Now we tried the usual fetch, but $sha1 may
 				# not be reachable from any of the refs