Aurelien DARRAGON 3f7c8387c0 MINOR: log: add +json encoding option
In this patch, we add the "+json" log format option that can be set
globally or per log format node.

What it does, it that it sets the LOG_OPT_ENCODE_JSON flag for the
current context which is provided to all lf_* log building function.

This way, all lf_* are now aware of this option and try to comply with
JSON specification when the option is set.

If the option is set globally, then sess_build_logline() will produce a
map-like object with key=val pairs for named logformat nodes.
(logformat nodes that don't have a name are simply ignored).

Example:
  log-format "%{+json}o %[int(4)] test %(named_field)[str(ok)]"

Will produce:
  {"named_field": "ok"}

If the option isn't set globally, but on a specific node instead, then
only the value will be encoded according to JSON specification.

Example:
  log-format "{ \"manual_key\": %(named_field){+json}[bool(true)] }"

Will produce:
  {"manual_key": true}

When the option is set, +E option will be ignored, and partial numerical
values (ie: because of logasap) will be encoded as-is.
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The HAProxy documentation has been split into a number of different files for
ease of use.

Please refer to the following files depending on what you're looking for :

  - INSTALL for instructions on how to build and install HAProxy
  - BRANCHES to understand the project's life cycle and what version to use
  - LICENSE for the project's license
  - CONTRIBUTING for the process to follow to submit contributions

The more detailed documentation is located into the doc/ directory :

  - doc/intro.txt for a quick introduction on HAProxy
  - doc/configuration.txt for the configuration's reference manual
  - doc/lua.txt for the Lua's reference manual
  - doc/SPOE.txt for how to use the SPOE engine
  - doc/network-namespaces.txt for how to use network namespaces under Linux
  - doc/management.txt for the management guide
  - doc/regression-testing.txt for how to use the regression testing suite
  - doc/peers.txt for the peers protocol reference
  - doc/coding-style.txt for how to adopt HAProxy's coding style
  - doc/internals for developer-specific documentation (not all up to date)
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