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

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: Ic1b19423f7a9d93e9bc76bf94b5d5e3101f8341d

masakarimonitors/processmonitor/process.py

@@ -35,7 +35,7 @@ class ProcessmonitorManager(manager.Manager):
 
     def _load_process_list(self):
         try:
-            process_list = yaml.load(open(CONF.process.process_list_path))
+            process_list = yaml.safe_load(open(CONF.process.process_list_path))
             LOG.debug("Loaded process list. %s" % process_list)
 
             return process_list