daemon: --access-hook option

The --access-hook option to "git daemon" specifies an external
command to be run every time a client connects, with

 - service name (e.g. "upload-pack", etc.),
 - path to the repository,
 - hostname (%H),
 - canonical hostname (%CH),
 - ip address (%IP),
 - tcp port (%P)

as its command line arguments.  The external command can decide to
decline the service by exiting with a non-zero status (or to allow it
by exiting with a zero status).  It can also look at the $REMOTE_ADDR
and $REMOTE_PORT environment variables to learn about the requestor
when making this decision.

The external command can optionally write a single line to its
standard output to be sent to the requestor as an error message when
it declines the service.

Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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