haproxy: fixes from upstream

this patch series mainly fixes a lot of reported issues in conjuction with
abstract socktet handling, improved the docs about the stats

 - [PATCH 13/21] BUILD: http: fix isdigit & isspace warnings on Solaris
 - [PATCH 14/21] BUG/MINOR: listener: set the listener's fd to -1 after
 - [PATCH 15/21] BUG/MEDIUM: unix: failed abstract socket binding is
 - [PATCH 16/21] MEDIUM: listener: implement a per-protocol pause()
 - [PATCH 17/21] MEDIUM: listener: support rebinding during resume()
 - [PATCH 18/21] BUG/MEDIUM: unix: completely unbind abstract sockets
 - [PATCH 19/21] DOC: explicitly mention the limits of abstract
 - [PATCH 20/21] DOC: expand the docs for the provided stats.
 - [PATCH 21/21] BUG/MEDIUM: backend: Update hash to use unsigned int

Signed-off-by: Thomas Heil <heil@terminal-consulting.de>