git-clone: lose the traditional 'no-separate-remote' layout

git-clone: lose the traditional 'no-separate-remote' layout

Finally.

The separate-remote layout is so much more organized than
traditional and easier to work with especially when you need to
deal with remote repositories with multiple branches and/or you
need to deal with more than one remote repositories, and using
traditional layout for new repositories simply does not make
much sense.

Internally we still have code for 1:1 mappings to create a bare
clone; that is a good thing and will not go away.

Signed-off-by: Junio C Hamano <junkio@cox.net>