Added a role to boot a SONiC switch to onie

partition/roles/sonic-boot-to-onie/README.md

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+# sonic-boot-to-onie
+
+Boots a SONiC switch into ONIE so it can be reinstalled from scratch.
+
+It depends on the `switch_facts` module from `ansible-common`, so make sure modules from `ansible-common` are included before executing this role.
+
+## Variables
+
+| Name                          | Mandatory | Description                                                                      |
+| ----------------------------- | --------- | -------------------------------------------------------------------------------- |
+| sonic_boot_to_onie_bootentry  | yes       | The efi boot entry number for the ONIE boot entry as seen with `efibootmgr`.     |

partition/roles/sonic-boot-to-onie/defaults/main.yaml

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+---
+sonic_boot_to_onie_bootentry: "0001"

partition/roles/sonic-boot-to-onie/tasks/main.yaml

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+---
+- name: Gather switch facts
+  switch_facts:
+
+- name: Check mandatory variables for this role are set
+  assert:
+    fail_msg: "not all mandatory variables given, check role documentation"
+    quiet: yes
+    that:
+      - sonic_boot_to_onie_bootentry is defined
+      - metal_stack_switch_os_is_sonic
+
+- name: Set next boot entry to ONIE
+  command: efibootmgr -n {{ sonic_boot_to_onie_bootentry }}
+
+- name: Boot into ONIE
+  reboot:
+
+- name: Wait until ZTP has completed
+  shell: "show ztp status"
+  register: result
+  until: "'SUCCESS' in result.stdout"
+  retries: 30
+  delay: 20