[RELEASE] Released version 1.3.15.9

[RELEASE] Released version 1.3.15.9

Released version 1.3.15.9 with the following main changes :
    - [BUILD] Fixed Makefile for linking pcre
    - [CONTRIB] selinux policy for haproxy
    - [DOC] Make the status listener example complete.
    - [BUILD] spec file: fix broken pipe during rpmbuild and add man file
    - [BUG] server check intervals must not be null
    - [BUG] check for global.maxconn before doing accept()
    - [BUILD] add format(printf) to printf-like functions
    - [MINOR] fix several printf formats and missing arguments
    - [BUG] stats: total and lbtot are unsigned
    - [MINOR] fix a few remaining printf-like formats on 64-bit platforms
    - [MEDIUM] ensure we don't recursively call pool_gc2()
    - [CRITICAL] uninitialized response field can sometimes cause crashes
    - [MINOR] rhel init script : support the reload operation
    - [BUG] O(1) pollers should check their FD before closing it
    - [MINOR] don't close stdio fds twice
    - [MINOR] stats/html: use the arial font before helvetica