Christopher Faulet 9d56e248a6 BUG/MEDIUM: ssl_ckch: Rework 'commit ssl cert' to handle full buffer cases
When changes on a certificate are commited, a trash buffer is used to create
the response. Once done, the message is copied in the response buffer.
However, if the buffer is full, there is no way to retry and the message is
lost. The same issue may happen with the error message. It is a design issue
of cli_io_handler_commit_cert() function.

To fix it, the function was reworked. First, the error message is now part
of the service context. This way, if we cannot push the error message in the
reponse buffer, we may retry later. To do so, a dedicated state was created
(CERT_ST_ERROR). Then, the success message is also handled in a dedicated
state (CERT_ST_SUCCESS). This way we are able to retry to push it if
necessary. Finally, the dot displayed for each updated CKCH instance is now
immediatly pushed in the response buffer, and before the update. This way,
we are able to retry too if necessary.

This patch should fix the issue #1725. It must be backported as far as
2.2. But massive refactoring was performed in 2.6. So, for the 2.5 and
below, the patch must be adapted.
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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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