Aurelien DARRAGON 5508db9a20 BUG/MINOR: hlua: fix unsafe lua_tostring() usage with empty stack
Lua documentation says that lua_tostring() returns a pointer that remains
valid as long as the object is not removed from the stack.

However there are some places were we use the returned string AFTER the
corresponding object is removed from the stack. In practise this doesn't
seem to cause visible bugs (probably because the pointer remains valid
waiting for a GC cycle), but let's fix that to comply with the
documentation and avoid undefined behavior.

It should be backported in all stable versions.
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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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