Support for sending OS command to LPAR/partition

[andy-maier]

Add support for sending an OS command to the OS running in an LPAR or partition, using the existing zhmcclient Lpar.send_os_command() and Partition.send_os_command() methods.

That support will not be idempotent.

This had been requested earlier in issue #565.

Here is a way to do that today, using the Ansible uri module to issue the HMC operation directly, and a session ID from the ibm_zhmc.zhmc_session module.

- name: Create an HMC session
  zhmc_session:
    hmc_host: "{{ my_hmc_host }}"
    hmc_auth:
      userid: "{{ my_hmc_userid }}"
      password: "{{ my_hmc_password }}"
      verify: false
    action: create
  register: session
  no_log: true

- name: "Send OS command {{ my_cmd }}"
  ansible.builtin.uri:
    url: "{{ session.hmc_host }}:6794{{ lpar_uri }}/operations/send-os-cmd"
    method: POST
    body:
      is-priority: false
      operating-system-command-text: "{{ my_cmd }}"
    headers:
      x-api-session: "{{ session.hmc_auth.session_id }}"
    validate_certs: no
    status_code: 204

- name: Delete the HMC session
  zhmc_session:
    hmc_host: "{{ session.hmc_host }}"  
    hmc_auth: "{{ session.hmc_auth }}"
    action: delete