Haproxystats

* Fix runtime error when specifying a custom list of metrics
* Check liveness of workers and exit if at least one is dead
* Fix formatting in README for group-namespace option

* Support grouping metrics by frontend, backend and server names

* Add missing comma

* Add supporting of ubuntu hosts and update Ansible playbook
* Also report about total requests for backend
* update readme file
* update Ansible Playbook and readme file

* Handle the absent of daemon's metric
* It's a counter, so should be in different section
* Update the list of supported metrics
* Use int rather string in the default values
* Use int rather string in default value
* Switch to correct section name for pycodestyle
* PEP257 compatible docstrings
* Switch from yarl.UR to urlparse from standard Python library
* Update reference of UNIX sockets to include TCP
* PEP257 compatible docstring
* Simplify the return logic of two functions
* Add configuration\_check\_for\_servers()
* PEP257 compatible docstrings
* Disable pylint warning for too-many-branches
* Change the log severity to info for task report
* Add support for pulling statistics from TCP sockets
* Make that code more readable
* PEP257 compatible docstrinigs
* Fix typo in README

* Add dcon and dses in the list of FRONTEND\_METRICS
* Add ctime in the list of SERVER\_AVG\_METRICS
* Add chkdown in the list of server metrics
* Add \`slim\` to server metrics, in addition to frontends and backends
* Mention in README about ansible and move code under contrib
* fix update readme file
* - Add Ansible Playbook For Fast Deploy haproxystats On CentOS 7.x - Update README File
* Fix a typo in README.rst
* Place metric back in the queue in case of OSError exc
* Log a message when graphite dispatcher queue is full
* Make docstrings compatible with EP257