Anycast-healthchecker

* Add 'status' key in the JSON blob
* Fix line break before binary operator
* Rewrite docstring of LoggerExt class
* Another set of docstring updates
* Update TODO
* Update docstrings and comments
* Use a more proper name for a variable
* Remove unused reference from README
* Update copyright

* Update TODO.rst
* Enforce HTTP keep-alive on requests

* Fix an indentation issue
* Fix a crash with python-daemon>=2.1

* Use lowercase for the status when is in transition
* Change log level when IP isn't assigned to lo
* Do not send JSON blob for debug messages
* Log only failures when sending JSON blobs
* Reorder the message about zero IP prefixes
* Include the process ID in the header

* Update TODO
* Use lowercase everywhere to simplify log parsing
* Print also the frame stuck
* Remove newline character from the error output
* Implement a more atomic way to update bird conf
* Disable pylint warnings for too-many-arguments
* Store anycast-prefixes.conf under /var/lib/

* Add a module docstring
* Add a warning when all IP prefixes are removed
* Shorten some lines to make pylint happy
* Add module and classes docstrings
* Add support of populating JSON structure
* Rename variable for shorting the length of a line
* Make possible to disable the sending of JSON blobs
* Disable pylint warning attribute-defined-outside-init
* Remove the JSON blob from the log messages
* Wait a bit before starting again the daemon
* Add docstring for a function
* Remove string interpolation within logging calls
* Add version of the daemon in the JSON blob
* Rename a variable for shorting the length of lines
* Add requests module in requirements.txt