Merge branch 'sb/push-make-submodule-check-the-default' into pu

Turn the default of "push.recurseSubmodules" to "check".

Alas, this reveals that the "check" mode is too inefficient to use
in real projects, even in ones as small as git itself.
cf. <[email protected]>

* sb/push-make-submodule-check-the-default:
  push: change submodule default to check

Author: gitster

builtin/push.c

@@ -22,7 +22,7 @@ static int deleterefs;
 static const char *receivepack;
 static int verbosity;
 static int progress = -1;
-static int recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
+static int recurse_submodules = RECURSE_SUBMODULES_CHECK;
 static enum transport_family family;
 
 static struct push_cas_option cas;