heat.conf should not be readable from other users

[LeileiZhou]

Mode for heat.conf is set as 644. However in this file contains some secrete information such as:
/etc/heat/heat.conf
qpid_password=
sql_connection=
[keystone_authtoken]
admin_password=keystone_password

Those information should not be readable from other unauthorized users.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/122322

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/122322
Committed: https://git.openstack.org/cgit/stackforge/cookbook-openstack-orchestration/commit/?id=eea627edda76e14aec07b9ececf4f81a265875a5
Submitter: Jenkins
Branch: master

commit eea627edda76e14aec07b9ececf4f81a265875a5
Author: leileiz <email address hidden>
Date: Thu Sep 18 01:55:49 2014 -0400

    Update heat.conf permission

    To avoid unauthorized users to read secrete information in
    heat.conf, heat.conf should be set as 640 instead of 644.

    Fix bug 1370870
    Change-Id: I02756cea10113ca89ddeaa9232d04c75380756e8