ironic: disable heartbeat_in_pthreads

inspector is not running as a WSGI

Related-Bug: #2054705
Change-Id: I20dbaef29b2ef2d6ceffc21c156c6fa4b5e8d205

ansible/roles/ironic/templates/ironic-inspector.conf.j2

@@ -13,7 +13,7 @@ transport_url = {{ rpc_transport_url }}
 transport_url = {{ notify_transport_url }}
 
 [oslo_messaging_rabbit]
-heartbeat_in_pthread = true
+heartbeat_in_pthread = false
 {% if om_enable_rabbitmq_tls | bool %}
 ssl = true
 ssl_ca_file = {{ om_rabbitmq_cacert }}