Source base cleanups

Source base cleanups

in trying to apply 2020 copyright to files, the pre-commit
hooks complain about random file issues.

- remove old corrections.py utility, this had something to do
  with repairing refs in the sphinx docs

- run pre commit hooks on all files

- formatting adjustments to work around code formatting collisions
  (long import lines that zimports can't rewrite correctly)

- for 1.3, update conf.py with formatted version

Change-Id: I260744866f69e902eb93665c7c728ee94d3371a2
(cherry picked from commit 748bf710fdeeed327933a5e7c277c7f79f6053a6)