Update net/haproxy to 1.6.4. Throw in example config files.

2016/03/14 : 1.6.4
- BUG/MINOR: http: fix several off-by-one errors in the url_param
  parser
- BUG/MINOR: http: Be sure to process all the data received from a
  server
- BUG/MINOR: chunk: make chunk_dup() always check and set
  dst->size
- MINOR: chunks: ensure that chunk_strcpy() adds a trailing zero
- MINOR: chunks: add chunk_strcat() and chunk_newstr()
- MINOR: chunk: make chunk_initstr() take a const string
- MINOR: lru: new function to delete <nb> least recently used keys
- DOC: add Ben Shillito as the maintainer of 51d
- BUG/MINOR: 51d: Ensures a unique domain for each configuration
- BUG/MINOR: 51d: Aligns Pattern cache implementation with HAProxy
  best practices.
- BUG/MINOR: 51d: Releases workset back to pool.
- BUG/MINOR: 51d: Aligned const pointers to changes in 51Degrees.
- CLEANUP: 51d: Aligned if statements with HAProxy best practices
  and removed casts from malloc.
- DOC: fix a few spelling mistakes
- DOC: fix "workaround" spelling
- BUG/MINOR: examples: Fixing haproxy.spec to remove references to
  .cfg files
- MINOR: fix the return type for dns_response_get_query_id()
  function
- MINOR: server state: missing LF (\n) on error message printed
  when parsing server state file
- BUG/MEDIUM: dns: no DNS resolution happens if no ports provided
  to the nameserver
- BUG/MAJOR: servers state: server port is erased when dns
  resolution is enabled on a server
- BUG/MEDIUM: servers state: server port is used uninitialized
- BUG/MEDIUM: config: Adding validation to stick-table expire
  value.
- BUG/MEDIUM: sample: http_date() doesn't provide the right day of
  the week
- BUG/MEDIUM: channel: fix miscalculation of available buffer
  space.
- MEDIUM: pools: add a new flag to avoid rounding pool size up
- BUG/MEDIUM: buffers: do not round up buffer size during
  allocation
- BUG/MINOR: stream: don't force retries if the server is DOWN
- BUG/MINOR: counters: make the sc-inc-gpc0 and sc-set-gpt0 touch
  the table
- MINOR: unix: don't mention free ports on EAGAIN
- BUG/CLEANUP: CLI: report the proper field states in "show sess"
- MINOR: stats: send content-length with the redirect to allow
  keep-alive
- BUG: stream_interface: Reuse connection even if the output
  channel is empty
- DOC: remove old tunnel mode assumptions
- BUG/MAJOR: http-reuse: fix risk of orphaned connections
- BUG/MEDIUM: http-reuse: do not share private connections across
  backends
- BUG/MINOR: ssl: Be sure to use unique serial for regenerated
  certificates
- BUG/MINOR: stats: fix missing comma in stats on agent drain
- BUG/MINOR: lua: unsafe initialization
- DOC: lua: fix somme errors
- DOC: add server name at rate-limit sessions example
- BUG/MEDIUM: ssl: fix off-by-one in ALPN list allocation
- BUG/MEDIUM: ssl: fix off-by-one in NPN list allocation
- DOC: LUA: fix some typos and syntax errors
- MINOR: cfgparse: warn for incorrect 'timeout retry' keyword
  spelling in resolvers
- MINOR: mailers: increase default timeout to 10 seconds
- MINOR: mailers: use <CRLF> for all line endings
- BUG/MAJOR: lua: applets can't sleep.
- BUG/MINOR: server: some prototypes are renamed
- BUG/MINOR: lua: Useless copy
- BUG/MEDIUM: stats: stats bind-process doesn't propagate the
  process mask correctly
- BUG/MINOR: server: fix the format of the warning on address
  change
- BUG/MEDIUM: chunks: always reject negative-length chunks
- BUG/MINOR: systemd: ensure we don't miss signals
- BUG/MINOR: systemd: report the correct signal in debug message
  output
- BUG/MINOR: systemd: propagate the correct signal to haproxy
- MINOR: systemd: ensure a reload doesn't mask a stop
- BUG/MEDIUM: cfgparse: wrong argument offset after parsing server
  "sni" keyword
- CLEANUP: stats: Avoid computation with uninitialized bits.
- CLEANUP: pattern: Ignore unknown samples in pat_match_ip().
- CLEANUP: map: Avoid memory leak in out-of-memory condition.
- BUG/MINOR: tcpcheck: fix incorrect list usage resulting in
  failure to load certain configs
- BUG/MAJOR: samples: check smp->strm before using it
- MINOR: sample: add a new helper to initialize the owner of a
  sample
- MINOR: sample: always set a new sample's owner before evaluating
  it
- BUG/MAJOR: vars: always retrieve the stream and session from the
  sample
- CLEANUP: payload: remove useless and confusing nullity checks
  for channel buffer
- BUG/MINOR: ssl: fix usage of the various sample fetch functions
- MINOR: cfgparse: warn when uid parameter is not a number
- MINOR: cfgparse: warn when gid parameter is not a number
- BUG/MINOR: standard: Avoid free of non-allocated pointer
- BUG/MINOR: pattern: Avoid memory leak on out-of-memory condition
- CLEANUP: http: fix a build warning introduced by a recent fix
- BUG/MINOR: log: GMT offset not updated when entering/leaving DST


(fhajny)