remove baremetal nodes when building CDM

aggregate list and availability_zone list may return ironic type
compute nodes. When building compute data model we should check
the hypervisor_type and remove ironic compute nodes.

Change-Id: Idf404c104c30368baf95ef7d05ad8fc3e7adca38
Related-Bug: #1835183

watcher/decision_engine/model/collector/nova.py

@@ -263,6 +263,10 @@ class ModelBuilder(object):
                                                               detailed=True)
             if cnode:
                 node_info = cnode[0]
+                # filter out baremetal node
+                if node_info.hypervisor_type == 'ironic':
+                    LOG.debug("filtering out baremetal node: %s", node_name)
+                    continue
                 self.add_compute_node(node_info)
                 # node.servers is a list of server objects
                 # New in nova version 2.53