Ignore template res types during guideline checks

Global environment during registering resources also load resources from
/etc/environment.d . As result it loads two resources mapped on
templates:
- 'AWS::CloudWatch::Alarm'
- 'AWS::RDS::DBInstance'

However execute guideline checks for these resources is not possible due
to these resources use template_resource object and can not be processed
as usual *.py file.

This patch add ignoring for these two resource types.
Note: this error is not displayed on pep8 gate job due to we don't
install devstack during execution this job, but this error affects all
environments with installed devstack.

Closes-Bug: #1552194

Change-Id: I29abdfa1a4f4a17dfbcdaaf6f0c6665359bab17a

tools/custom_guidelines.py

@@ -33,6 +33,9 @@ class HeatCustomGuidelines(object):
         global_env = resources.global_env()
         for resource_type in global_env.get_types():
             cls = global_env.get_class(resource_type)
+            # Skip resources, which defined as template resource in environment
+            if cls.__module__ == 'heat.engine.resources.template_resource':
+                continue
             if (lambda module: True
                 if [path for path in exclude if path in module]
                     else False)(cls.__module__.replace('.', '/')):