Adding nodes using pxe_ilo driver, fails and provision state stays in enroll

Issue

• seen on
  • Proliant DL360 Gen9
  • Proliant BL460C Gen8
  • Proliant DL380 Gen9
  • ProliantSL450 Gen8

$ cat templates/instackenv-compute.json
{
  "nodes": [
    {
      "pm_user": "ilouser",
      "mac": [
        "48:df:37:01:a2:1d",
        "48:df:37:01:d2:5d"
      ],
      "pm_type": "pxe_ilo",
      "pm_password": "ilopassword",
      "pm_addr": "x.x.x.x",
      "capabilities": "profile:compute",
      "name": "overcloud-compute01"
    },
    ....

• import the nodes via

$ openstack overcloud node import ~/instackenv.json

• checking the node status

$ openstack baremetal node list

=> provision state stays in enroll