Log Message:
Update net/haproxy to version 1.7.9

ChangeLog:
- BUG/MINOR: peers: peer synchronization issue (with several peers sections).
- BUG/MINOR: lua: In error case, the safe mode is not removed
- BUG/MINOR: lua: executes the function destroying the Lua session in safe mode
- BUG/MAJOR: lua/socket: resources not detroyed when the socket is aborted
- BUG/MEDIUM: lua: bad memory access
- DOC: update CONTRIBUTING regarding optional parts and message format
- DOC: update the list of OpenSSL versions in the README
- MINOR: tools: add a portable timegm() alternative
- BUILD: lua: replace timegm() with my_timegm() to fix build on Solaris 10
- DOC: Updated 51Degrees git URL to point to a stable version.
- BUG/MINOR: http: Set the response error state in http_sync_res_state
- MINOR: http: Reorder/rewrite checks in http_resync_states
- MINOR: http: Switch requests/responses in TUNNEL mode only by checking txn flags
- BUG/MEDIUM: http: Switch HTTP responses in TUNNEL mode when body length is \ 
undefined
- BUG/MAJOR: http: Fix possible infinity loop in http_sync_(req|res)_state
- BUG/MINOR: lua: Fix Server.get_addr() port values
- BUG/MINOR: lua: Correctly use INET6_ADDRSTRLEN in Server.get_addr()
- BUG/MINOR: lua: always detach the tcp/http tasks before freeing them
- BUG/MINOR: lua: Fix bitwise logic for hlua_server_check_* functions.