Add CLI configuration documentation

This patch allows a module to define its configuration in XML in source, such
that it can be parsed by the XML documentation engine. Documentation is
generated in a two-pass approach:

1. The documentation is first generated from the XML pulled from the source
2. The documentation is then enhanced by the registration of configuration
   options that use the configuration framework

This patch include configuration documentation for the following modules:
 * chan_motif
 * res_xmpp
 * app_confbridge
 * app_skel
 * udptl

Two new CLI commands have been added:
 * config show help - show configuration help by module, category, and item
 * xmldoc dump - dump the in-memory representation of the XML documentation to
   a new XML file.

Review: https://reviewboard.asterisk.org/r/2278
Review: https://reviewboard.asterisk.org/r/2058

patches:
  on review 2058 uploaded by twilson



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@381527 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/_private.h

@@ -49,6 +49,7 @@ int ast_ssl_init(void);                 /*!< Provided by ssl.c */
 int ast_test_init(void);            /*!< Provided by test.c */
 int ast_msg_init(void);             /*!< Provided by message.c */
 void ast_msg_shutdown(void);        /*!< Provided by message.c */
+int aco_init(void);             /*!< Provided by config_options.c */
 
 /*!
  * \brief Reload asterisk modules.