Haproxytool

* update haproxy cmd usage in README
* BUGFIX: options for haproxy command are required elements
* BUGFIX: don't mix w and m arguments and a cosmetic change in help
* exception message mentions socket file, so no need to print it
* update usage section of haproxy command in README

* add more functionality to haproxy command
* add a function to print a common structure we get from haproxyadmin
* BUGFIX: add missing -M argument in haproxy command

* add in README section for haproxy command
* add support for managing some options/metric for haproxy
* version is set in \_\_init\_\_, use that one
* update README to reflect the changes in frontend CLI
* add support for force and abort operations in frontend
* order frontend options alphabetically
* we don't need help option mentioned in the usage header
* order backend options alphabetically
* order server options alphabetically

* update README for the new usage on server command
* remove unused sorted\_nicely function
* support for abort also when we drain servers or set them in maintenance
* update README for the new option(f) in server subcommand
* add six module in requirements as it was introduced by 2819db4f
* add -f option to force disabling servers
* prompt user when he disables server
* remove unnecessary brackets
* add a read\_user input function

* use the correct state when set a server in maintenance mode
* Fix typo in README.RST
* introduce class also for MAP command as we did with dad1424
* acl.py: use a proper name for the class which perform commands for ACL
* include version in \_\_init\_\_.py

* add examples for ACL in README
* fixes in acl support for delete and add functions
* add support for ACLs