haproxy: fixes from upstream

 - [PATCH 10/12] MINOR: stats: fix minor typo in HTML page
 - [PATCH 11/12] BUG/MEDIUM: unix: do not unlink() abstract namespace
 - [PATCH 12/12] DOC: provide an example of how to use ssl_c_sha1

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