pylint: Fix remaining pylint refactor (Rxxxx) problems #1281
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Corrects many of the refactor suggestions from pylint. Some others are ignored (
too-many-*
andtoo-few-*
, for example) because of the work required to rewrite the code.Tests for
check_isolation_executable_installed()
were required to be modified (due to adding use of context manager forPopen()
) to be much simpler and not requireMock
-ing the world.