Anycast-healthchecker

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* added git push --tags step in README
* Added (finally) some text in README
* Renamed variable is\_updated -> bird\_updated
* another small doc update
* Various small docstrings updates
* Rewrote ServiceCheck class docstring and changed log severity to error
* Fixed indentation issue and rewrote message when IP-PREFIX is configured
* Catch the case where conf says check disabled but value for on\_disabled is wrong
* Changelog updated

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* Better handling of errors when we reload bird
* Fixed typos
* Changelog updated

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* Added program name in the header of bird configuration
* Detect if IP-PREFIX is assigned to loopback interface
* changelog

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* mpla

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* Constant name is configurable, sysconfig file
* Cosmetic change
* removed unused script

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* mpla