Ensure Boolean Strings from the environment are treated correctly

This happens because we use six.text_type() to convert the oslo.config
options into a strings so we can pass it via environment
variables[1,2,3].

[1] http://git.openstack.org/cgit/openstack/instack-undercloud/tree/instack_undercloud/undercloud.py#n1229
[2] http://git.openstack.org/cgit/openstack/instack-undercloud/tree/instack_undercloud/undercloud.py#n1371
[3] http://git.openstack.org/cgit/openstack/instack-undercloud/tree/instack_undercloud/undercloud.py#n550

Change-Id: I5830a856960856af1a045d6eda609b8abb20658d
Closes-Bug: 1743679
(cherry picked from commit 28fd522886)

elements/puppet-stack-config/install.d/02-puppet-stack-config

@@ -36,6 +36,13 @@ for k, v in os.environ.items():
         endpoint_context[k] = v
 context.update(endpoint_context)
 
+# Make sure boolean strings are treated as Bool()
+for k, v in list(context.items()):
+    if v == 'False':
+        context[k] = False
+    elif v == 'True':
+        context[k] = True
+
 with open(template) as f:
     puppet_stack_config_yaml = renderer.render(f.read(), context)