nuke: s/yaml.load/yaml.safe_load/
nuke: s/yaml.load/yaml.safe_load/

to silence following warning:

YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.

Signed-off-by: Kefu Chai <a4b264ee037c625052534d60505bfd0db4776ac4@redhat.com>

SUSE/teuthology,dmick/teuthology,ktdreyer/teuthology,ktdreyer/teuthology,SUSE/teuthology,ceph/teuthology,SUSE/teuthology,dmick/teuthology,dmick/teuthology,ceph/teuthology