Update various stale documentation files etc. upgrade the docker file to buster, update dependecies that are packages along with stapled.

Finalise the parsing of HAProxy config files feature and a whole bunch of cleanup and code readability issues.

Allow --haproxy-config to be consumed and add it to the list of paths in --directories, deduplicate, simplify adder so its key is just the socket path and the socket_paths attribute contains the actual mapping, that way multiple directories can correspond with a single socket and a single directory can also correspond with multiple sockets.

Replace ocspd with stapled and OCSPD with Stapled and OCSP\* with Staple\*, move files from any ocsp(d) to staple(d) too.

Untested state, needs work, added recursion for testing (may need to move to another branch), fixed some bugs.

Manage threads completely, restart crashed threads and monitor KeyBoardInterrupt to start shutting down threads and self.

First step to back porting to python2.7, fix colourlog for python3 (also fix a few unrelated PEP8 issues)

move everything to its own "ocspd" module. Also add the ocspd command as "ocspd" to the setup.py so we do not need a separat py file in the project root

Remove exception handling from the areas where error sensitive calls happen, add them back to the handler. Subclass the scheduled task class and add a method for remembering and counting the last exception. Move scheduling to its own module (can be re-used in another project now). Move documentation for the scheduler, add documentation for the subclassed task context.

Go through all error sensitive code and make it raise categorised exceptions for the error handler to process, error handling is now mostly not working, needs to be reconstructed in the error handler based on empty except: statements and notes.

* remove for loop and instead use dict(map())
* remove an "else" because Chris likes his toast differently...
* remove a log statement that was never reached and actually only used for
  debugging in the beginning

Moved around some code for making base64 output and only prints requests and responses if verbosity mode is DEBUG.

Fixed some merge conflicts and added some __init__.py files, moved some constants from modules and placed them in the ocspd.py files so they are kept centrally.