Update pytest from 3.7.2 to 3.7.3 (#3957)
Update pytest from 3.7.2 to 3.7.3 (#3957)


KWierso/treeherder,edmorley/treeherder,KWierso/treeherder,edmorley/treeherder,KWierso/treeherder,KWierso/treeherder,edmorley/treeherder,edmorley/treeherder