Comment 8 for bug 1634265

Reviewed: https://review.openstack.org/420595
Committed: https://git.openstack.org/cgit/openstack/rally/commit/?id=8cec258b80e84d71ec48a472f976a437d8185e74
Submitter: Jenkins
Branch: master

commit 8cec258b80e84d71ec48a472f976a437d8185e74
Author: Luong Anh Tuan <email address hidden>
Date: Mon Jan 16 16:14:38 2017 +0700

    Replace yaml.load() with yaml.safe_load()

    Avoid dangerous file parsing and object serialization libraries.
    yaml.load is the obvious function to use but it is dangerous[1]
    Because yaml.load return Python object may be dangerous if you
    receive a YAML document from an untrusted source such as the
    Internet. The function yaml.safe_load limits this ability to
    simple Python objects like integers or lists.

    In addition, Bandit flags yaml.load() as security risk so replace
    all occurrences with yaml.safe_load(). Thus I replace yaml.load()
    with yaml.safe_load()

    [1]https://security.openstack.org/guidelines/dg_avoid-dangerous-input-parsing-libraries.html

    Change-Id: I4aac907c2a7ecf9a3f85a1a07ca020df6eb0b756
    Closes-Bug: #1634265