pylint failing for stx-integ on keyring

[Al Bailey]

Zuul jobs for starlingx/integ are failing in pylint while setting up python requirements for keyring.
This is because the 19.0.x version of keyring is only supported in python3 despite it being built as universal wheel.

This needs to be fixed before any reviews in starlingx/integ can pass zuul and merge.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/657817

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/657817
Committed: https://git.openstack.org/cgit/starlingx/integ/commit/?id=160e1165557d70d2e6eb7d29cb5a2800a074bc99
Submitter: Zuul
Branch: master

commit 160e1165557d70d2e6eb7d29cb5a2800a074bc99
Author: Al Bailey <email address hidden>
Date: Wed May 8 09:17:40 2019 -0500

    Fix pylint failures due to keyring

    The pylint tox setup failures are because keyring 19.x does not
    work with python2.7.
    This is now imposed in the tox.ini file.

    Closes-Bug: 1828241
    Change-Id: Ib6219a508ef843358b46b2f49c4da28d1a8bbec8
    Signed-off-by: Al Bailey <email address hidden>

[Ghada Khalil (gkhalil)]

Marking as release gating; this was blocking code merges.