Unable to import baremetal nodes.

Hi,

Description
===========

We are deploying TripleO Train and while importing overcloud nodes import stucks at

HTTP POST https://172.30.3.13:13989/v2/executions 201
Started Mistral Workflow tripleo.baremetal.v1.register_or_update. Execution ID: 5cdbeb50-7cb4-4377-967c-2eae28c27b53
Waiting for messages on queue 'tripleo' with no timeout.

Steps to reproduce
==================

1) Deployed Undercloud on Centos 7.9.
2) Imported images.
3) Importing nodes using command:- openstack overcloud node import ~/instackenv.json

(undercloud) [stack@undercloudtripleo ~]$ cat instackenv.json
{
    "nodes":[
        {
            "mac":[
                "52:54:00:6d:94:8f"
            ],
            "name":"TripleO_Controller",
            "cpu":"24",
            "memory":"40960",
            "disk":"200",
            "arch":"x86_64",
            "pm_type":"ipmi",
            "pm_user":"admin",
            "pm_addr": "172.30.3.200",
            "pm_password": "Password1!",
            "pm_port": "6230"
        },
        {
            "mac":[
                "52:54:00:49:11:61"
            ],
            "name":"TripleO_Compute",
            "cpu":"16",
            "memory":"32768",
            "disk":"200",
            "arch":"x86_64",
            "pm_type":"ipmi",
            "pm_user":"admin",
            "pm_addr": "172.30.3.200",
            "pm_password": "Password1!",
            "pm_port": "6231"
        }
    ]
}

Expected result
===============

Nodes should get imported successfully

Actual result
=============

Import stuck at

HTTP POST https://172.30.3.13:13989/v2/executions 201
Started Mistral Workflow tripleo.baremetal.v1.register_or_update. Execution ID: 5cdbeb50-7cb4-4377-967c-2eae28c27b53
Waiting for messages on queue 'tripleo' with no timeout.

Environment
===========

TripleO Undercloud and overcloud nodes on KVM box.

Used VBMC drivers on KVM.

Logs & Configs
==============

http://paste.openstack.org/show/804039/