Address lint failures

[codeboten]

During the shift of instrumentation and exporter packages to the contrib repo, some issues were found in the linting, see failures here:

https://github.com/open-telemetry/opentelemetry-python-contrib/runs/1349549074

See discussion in gitter: https://gitter.im/open-telemetry/opentelemetry-python?at=5fa1b98bbf955735eb595894

[NathanielRN]

Specifically, this command in eachdist.py is the lint command that is failing. For some reason it says the items in the insturmentation/ package are not lint compliant, even though they were compliant when they were in the Core repo and this was directly brought over from the Contrib repo.

opentelemetry-python-contrib/scripts/eachdist.py

Lines 518 to 522 in 5c9e043

	execute_args(
	parse_subargs(
	args, ("exec", "pylint {}", "--all", "--mode", "lintroots")
	)
	)