Change use of random to random.SystemRandom

There's no reason to use random directly unless the code really
requires a pseudo-random number generator. This is for security
hardening and identified by the security static analysis project
called Bandit.

SecImpact

Change-Id: I6b5fdd8ab17ec6ed2cb8c195bee1fb5da0e90e9f

oslo_vmware/objects/datastore.py

@@ -14,7 +14,7 @@
 
 import logging
 import posixpath
-import random
+import random as _random
 
 import six.moves.http_client as httplib
 import six.moves.urllib.parse as urlparse
@@ -25,6 +25,7 @@ from oslo_vmware import exceptions
 from oslo_vmware import vim_util
 
 LOG = logging.getLogger(__name__)
+random = _random.SystemRandom()
 
 
 class Datastore(object):