Non-numeric filenames in key_repository will make Keystone explode

[Clint Byrum]

If one makes any files in that directory, such as an editor backup, Keystone will explode on startup or at the next key rotation because it assumes all files will pass int(filename)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/206177

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/206177
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=7223bb1c035d98ebb1a49e115f05cb69ad7928d4
Submitter: Jenkins
Branch: master

commit 7223bb1c035d98ebb1a49e115f05cb69ad7928d4
Author: Clint Byrum <email address hidden>
Date: Mon Jul 27 11:14:30 2015 -0700

    Handle non-numeric files in key_repository

    It is very likely administrators will leave behind bits and pieces in a
    live environment. One cannot assume that all of the files in a directory
    will be the ones created by Keystone.

    Change-Id: I5841a11f599f79d2efbe1a176f499e280a91cb37
    Closes-Bug: #1478656

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/kilo
Review: https://review.openstack.org/207495

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/207495
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=6c106e980075a301b21e1907ab0c681dd5d91e88
Submitter: Jenkins
Branch: stable/kilo

commit 6c106e980075a301b21e1907ab0c681dd5d91e88
Author: Clint Byrum <email address hidden>
Date: Mon Jul 27 11:14:30 2015 -0700

    Handle non-numeric files in key_repository

    It is very likely administrators will leave behind bits and pieces in a
    live environment. One cannot assume that all of the files in a directory
    will be the ones created by Keystone.

    Change-Id: I5841a11f599f79d2efbe1a176f499e280a91cb37
    Closes-Bug: #1478656
    (cherry picked from commit 7223bb1c035d98ebb1a49e115f05cb69ad7928d4)