TC-PS-3.1: Add cluster revision check

This allows the test suite to be dual-purposed against existing
devices in the field as well as being used for cert. Correct cluster
revision for cert testing purposes is tested in the TC-PS-1.1 test.

Test: Down-rev'd one PS cluster on all clusters and removed
      EndpointList - saw note, test passes.

src/python_testing/TC_DeviceBasicComposition.py

@@ -465,8 +465,15 @@ def test_TC_PS_3_1(self):
         for endpoint_id, endpoint in self.endpoints.items():
             if Clusters.PowerSource not in endpoint:
                 continue
+            location = AttributePathLocation(endpoint_id=endpoint_id, cluster_id=cluster_id, attribute_id=attribute_id)
+            if Clusters.PowerSource.Attributes.ClusterRevision not in endpoint[Clusters.PowerSource]:
+                self.record_error(self.get_test_name(
+                ), location=location, problem=f'Did not find Cluster revision on {location.as_cluster_string(self.cluster_mapper)}', spec_location='Global attributes')
+            if endpoint[Clusters.PowerSource][Clusters.PowerSource.Attributes.ClusterRevision] < 2:
+                self.record_note(self.get_test_name(), location=location,
+                                 problem=f'Power source ClusterRevision is < 2, skipping remainder of test for this endpoint')
+                continue
             if Clusters.PowerSource.Attributes.EndpointList not in endpoint[Clusters.PowerSource]:
-                location = AttributePathLocation(endpoint_id=endpoint_id, cluster_id=cluster_id, attribute_id=attribute_id)
                 self.record_error(self.get_test_name(), location=location,
                                   problem=f'Did not find {attribute_string} on {location.as_cluster_string(self.cluster_mapper)}', spec_location="EndpointList Attribute")
                 success = False