Update license to AGPL-3.0 or any later

[jjnicola]

Update year as well.

Some minor code changes were automatically made by black

[codecov]

Codecov Report

Merging #241 into master will not change coverage by %.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #241   +/-   ##
=======================================
  Coverage   73.72%   73.72%           
=======================================
  Files          19       19           
  Lines        2234     2234           
=======================================
  Hits         1647     1647           
  Misses        587      587           

Impacted Files	Coverage Δ
ospd/command/command.py	87.57% <ø> (ø)
ospd/command/initsubclass.py	20.00% <ø> (ø)
ospd/command/registry.py	100.00% <ø> (ø)
ospd/cvss.py	85.71% <ø> (ø)
ospd/errors.py	100.00% <ø> (ø)
ospd/main.py	0.00% <ø> (ø)
ospd/misc.py	51.56% <ø> (ø)
ospd/network.py	72.11% <ø> (ø)
ospd/ospd.py	75.32% <ø> (ø)
ospd/ospd_ssh.py	89.36% <ø> (ø)
... and 9 more

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