None of these were any real problems, but easier to spot real issues if pylint
is a bit quieter. Apart from the pylint overrides being sprinkled over the code
base, this commit also fixes occurences of the following issues:
- logging-not-lazy
- logging-format-interpolation
- unused-import
- unused-variable
The default handle method will look for a supported_domains attribute
(a list), containing the supported domains. The subclassed service
class can of course override this if other means of determining support
is needded.