This change fixes up a variety of issues with our logging code:

Many places were logging to the root logger instead of named loggers.
Commands had a mix of root loggers and named loggers but they should

  all have been using self.log instead.
A few places were formatting strings before the logging call, rather

  than passing them in as arguments.

Ran unit tests.
Verified that code updated to use self.log showed output

  appropriately.