[QA][CI] The job 'gate-fuel-qa-pylint' fails with new version of pylint

[Artem Panchenko]

New version of pylint 1.6 contains new checkers:

https://github.com/PyCQA/pylint/blob/pylint-1.6.0/ChangeLog#L55-L56

This causes failure of 'fuel-qa' gate job:

2016-07-08 07:02:06.368468 | ************* Module fuelweb_test.testrail.report
2016-07-08 07:02:06.368654 | C: 76,17: Consider iterating the dictionary directly instead of calling .keys() (consider-iterating-dictionary)
2016-07-08 07:02:06.368689 | ************* Module fuelweb_test.testrail.generate_failure_group_statistics
2016-07-08 07:02:06.368726 | C:443,32: Consider iterating the dictionary directly instead of calling .keys() (consider-iterating-dictionary)
2016-07-08 07:02:06.368769 | C:444,20: Consider iterating the dictionary directly instead of calling .keys() (consider-iterating-dictionary)
2016-07-08 07:02:06.368788 | ************* Module fuelweb_test.helpers.checkers
2016-07-08 07:02:06.368821 | C:511,21: Consider iterating the dictionary directly instead of calling .keys() (consider-iterating-dictionary)
2016-07-08 07:02:06.368854 | C:571,24: Consider iterating the dictionary directly instead of calling .keys() (consider-iterating-dictionary)
2016-07-08 07:02:06.368887 | C:587,26: Consider iterating the dictionary directly instead of calling .keys() (consider-iterating-dictionary)
2016-07-08 07:02:06.368924 | ************* Module fuelweb_test.helpers.patching
2016-07-08 07:02:06.368958 | C:399,15: Consider iterating the dictionary directly instead of calling .keys() (consider-iterating-dictionary

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/339391

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/339391
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=fa2d058d49a6c3786db50ee24a459e43ee43200b
Submitter: Jenkins
Branch: master

commit fa2d058d49a6c3786db50ee24a459e43ee43200b
Author: Artem Panchenko <email address hidden>
Date: Fri Jul 8 10:23:16 2016 +0300

    Don't use .keys() method while iterating over dict

    Closes-bug: #1600132

    Change-Id: I49ee06d795280f572db07c9537310433f07bd0ab

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/339483

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/339483
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=e3c61048d37270d0ef20d85e0cc39e88e79cf5b5
Submitter: Jenkins
Branch: stable/mitaka

commit e3c61048d37270d0ef20d85e0cc39e88e79cf5b5
Author: Artem Panchenko <email address hidden>
Date: Fri Jul 8 10:23:16 2016 +0300

    Don't use .keys() method while iterating over dict

    Closes-bug: #1600132

    Change-Id: I49ee06d795280f572db07c9537310433f07bd0ab
    (cherry picked from commit fa2d058d49a6c3786db50ee24a459e43ee43200b)