Replaces yaml.load() with yaml.safe_load() in neutron

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.

Reference:
https://security.openstack.org/guidelines/dg_avoid-dangerous-input-parsing-libraries.html

Change-Id: I026355f3e71b7fd3aeee2fe5c7920a1c6306ab02

tools/abandon_old_reviews.sh

@@ -57,7 +57,7 @@ import yaml
 
 data = urllib2.urlopen("https://raw.githubusercontent.com/openstack/"
                        "governance/master/reference/projects.yaml")
-governance = yaml.load(data)
+governance = yaml.safe_load(data)
 stadium = governance["neutron"]["deliverables"].keys()
 query = ["project:openstack/%s" % p for p in stadium]
 print ' OR '.join(query)