Bug 1270801 - Update pytest from 2.9.0 to 2.9.1
Bug 1270801 - Update pytest from 2.9.0 to 2.9.1

http://pytest.org/latest/changelog.html
https://github.com/pytest-dev/pytest/compare/2.9.0...2.9.1

tojonmz/treeherder,akhileshpillai/treeherder,kapy2010/treeherder,akhileshpillai/treeherder,akhileshpillai/treeherder,glenn124f/treeherder,kapy2010/treeherder,tojon/treeherder,kapy2010/treeherder,KWierso/treeherder,glenn124f/treeherder,tojon/treeherder,edmorley/treeherder,tojonmz/treeherder,glenn124f/treeherder,edmorley/treeherder,akhileshpillai/treeherder,tojonmz/treeherder,akhileshpillai/treeherder,glenn124f/treeherder,KWierso/treeherder,tojonmz/treeherder,akhileshpillai/treeherder,edmorley/treeherder,glenn124f/treeherder,tojon/treeherder,KWierso/treeherder,kapy2010/treeherder,tojonmz/treeherder,tojon/treeherder,tojonmz/treeherder,glenn124f/treeherder,KWierso/treeherder,kapy2010/treeherder,edmorley/treeherder