Remove .coveragerc (#2984)
Remove .coveragerc (#2984)

Since it's not currently used, and at whatever point we add Python
test coverage tracking, we'll likely need to overhaul it anyway.
edmorley/treeherder,edmorley/treeherder,KWierso/treeherder,edmorley/treeherder,KWierso/treeherder,edmorley/treeherder,KWierso/treeherder,KWierso/treeherder