Execute publisher count in the logging function

[indykoning]

Currently when not all CNAMEs have been published we log a different message.
In the check we correctly execute the count function to get the count.
While logging the warning we have forgotten to do so, causing the following error.

restarting cname.py with /usr/src/app/cnames
starting cname.py
--- Logging error ---
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/logging/__init__.py", line 1083, in emit
    msg = self.format(record)
  File "/usr/local/lib/python3.9/logging/__init__.py", line 927, in format
    return fmt.format(record)
  File "/usr/local/lib/python3.9/logging/__init__.py", line 663, in format
    record.message = record.getMessage()
  File "/usr/local/lib/python3.9/logging/__init__.py", line 367, in getMessage
    msg = msg % self.args
TypeError: %d format: a number is required, not method
Call stack:
  File "/usr/src/app/cname.py", line 93, in <module>
    main()
  File "/usr/src/app/cname.py", line 88, in main
    log.warning("%d of %d published", publisher.count, len(cnames))
Message: '%d of %d published'
Arguments: (<bound method AvahiPublisher.count of <mpublisher.mpublisher.AvahiPublisher object at 0x7fb04e774760>>, 16)