log refactoring

[thefab]

Because of https://github.com/metwork-framework/mfserv/issues/281 and https://github.com/metwork-framework/mfext/issues/571, we propose a big log refactoring for metwork.

Changes:

• [x] develop https://github.com/metwork-framework/log_proxy
• [x] add log_proxy to mfext in layer0_core
• [x] introduce a template system for modules config.ini
• [x] migration mfserv config.ini in new templated system: config.ini.custom
• [x] migration mfdata config.ini in new templated system: config.ini.custom
• [x] migration mfbase config.ini in new templated system: config.ini.custom
• [x] migration mfsysmon config.ini in new templated system: config.ini.custom
• [x] migration mfadmin config.ini in new templated system: config.ini.custom
• [x] provide a log_proxy global configuration for all modules
  • [x] number of files to keep
  • [x] maximum size of files
  • [x] maximum age of files
  • [x] (for plugins) split stdout/stderr in different files (yes/no)
  • [x] (for plugins) split multiple workers in different files (yes/no)
• [x] provide a plugin configuration for overriding global configuration for:
  • [x] split stdout/stderr in different files (yes/no)
  • [x] split multiple workers in different files (yes/no)
• [x] replace std_redirect in all circus workers by corresponding tool in log_proxy
  • [x] in mfext templates
  • [x] in mfserv
  • [x] in  mfdata
  • [x] in mfbase
  • [x] in mfsysmon
  • [x] in mfadmin
• [x] add log_proxy usage in crontab for mfserv
• [x] add log_proxy usage in crontab for mfdata
• [x] add log_proxy usage in crontab for mfbase
• [x] add log_proxy usage in crontab for mfsysmon
• [x] add log_proxy usage in crontab for mfadmin
• [x] deal with nginx: https://stackoverflow.com/questions/22541333/have-nginx-access-log-and-error-log-log-to-stdout-and-stderr-of-master-process
  • [x] stdout/stderr for nginx (in mfserv)
  • [x] custom log maximum size in config (in mfserv)
  • [x] stdout/stderr for nginx (in mfbase)
  • [x] stdout/stderr for nginx (in mfdata)
• [x] stop to use logrotate copytruncate feature
• [x] add https://github.com/metwork-framework/jsonsyslog2elasticsearch in mfext
• [x] remove https://github.com/metwork-framework/jsonlog2elasticsearch from mfext
• [x] deprecate https://github.com/metwork-framework/jsonlog2elasticsearch
• [x] changes in mflog to replace json_logs.log feature with syslog to jsonsyslog2elasticsearch
• [x] new syslog configuration for mflog in common profile
• [x] same change for nodejs lib (work started in https://github.com/metwork-framework/mfserv/pull/309)