enable separate reflog for HEAD
enable separate reflog for HEAD

If HEAD is tied to a branch then both logs/HEAD and logs/heads/<branch> are
updated.  This is also true for any symbolic refs in general, but only HEAD
will see its reflog created automatically.

Signed-off-by: Nicolas Pitre <d659c10e27d52b00987b65e85d99bce5480adcae@cam.org>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

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