Secret key generation test should use less permissive chmod

[Gabriel Hurley]

While working on the Bandit framework with the OpenStack Security Group it flagged the chmod 777 in the SecretKeyTests.test_generate_or_read_key_from_file test.

While this is a trivial issue that applies only to the test suite, using a 644 permission accomplishes the same thing and is better principle. Also it makes Bandit happy, and it's one less thing to flag in the future.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/156752

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/156752
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=1149cd85665cf6a5841a462859779336037a44b8
Submitter: Jenkins
Branch: master

commit 1149cd85665cf6a5841a462859779336037a44b8
Author: Gabriel Hurley <email address hidden>
Date: Tue Feb 10 22:40:15 2015 -0800

    Use less permissive chmod in secret key test

    Switch to using 644 instead of 777 for a trivial increase
    in "best practice security".

    Closes Bug: #1422891

    Change-Id: I74dad5ae017b234f23d6e4a1b9099c62a1cd1e09