Undercloud post-install fails

[Sagi (Sergey) Shnaidman]

When running post-install task in undercloud role:

https://github.com/openstack/tripleo-quickstart/blob/c8c6e57ca2aad70c859505e02213ddfe40223e19/roles/tripleo/undercloud/tasks/post-install.yml#L39-L39

command: >
    vbmc add {{item.name}} --port {{item.virtualbmc_port}} --libvirt-uri "qemu+ssh://{{ non_root_user }}@{{ networks[0].address }}/session?socket=/run/user/{{ hostvars[groups['virthost'][0]].non_root_user_uid }}/libvirt/libvirt-sock&keyfile=/root/.ssh/id_rsa_virt_power&no_verify=1&no_tty=1"
  with_items: "{{ overcloud_nodes }}"

it fails when 'non_root_user' and 'non_root_user_id' are not set, for example if not using the "provision" role.
They are set only in:
https://github.com/openstack/tripleo-quickstart/blob/c8c6e57ca2aad70c859505e02213ddfe40223e19/roles/provision/remote/tasks/main.yml#L36-L50

[Sagi (Sergey) Shnaidman (sshnaidm)]

Changes are from patch: VirtualBMC support for tripleo-quickstart
https://github.com/openstack/tripleo-quickstart/commit/79263b18dff77be787243d22581ba1c250f8c260

[Sagi (Sergey) Shnaidman (sshnaidm)]

"/root/.ssh/id_rsa_virt_power" from this command does not present on upstream jobs.

[Sagi (Sergey) Shnaidman (sshnaidm)]

http://logs.openstack.org/31/404831/41/experimental-tripleo/gate-tripleo-ci-centos-7-ovb-nonha-oooq/4a2435f/console.html#_2016-12-19_23_26_15_962424

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/413635

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/413639

[OpenStack Infra (hudson-openstack)]

Change abandoned by John Trowbridge (<email address hidden>) on branch: master
Review: https://review.openstack.org/413635
Reason: whoops this should have been on extras:

https://review.openstack.org/413243

[OpenStack Infra (hudson-openstack)]

Change abandoned by Lucas Alvares Gomes (<email address hidden>) on branch: master
Review: https://review.openstack.org/413639