Make possible to disable the sending of JSON blobs
Make possible to disable the sending of JSON blobs

When json_logging is enabled we build and send JSON blob for all
log messages. Now it is possible to skip this by setting json_blob
to False when we emit a message::
    self.log.info('message', json_blob=False)

unixsurfer/anycast_healthchecker,unixsurfer/anycast_healthchecker,unixsurfer/anycast_healthchecker