Insert hosts entries to the beginning of the file.

This ensures that the first host entry found for a host
will use what is generated by TripleO (if applicable).

Change-Id: I3a4883bc0c8dfa480ce5fd10ec40f3a9f0cff217
Closes-Bug: #1861035
Signed-off-by: Luke Short <ekultails@gmail.com>
(cherry picked from commit 76fd2eaacc)

tripleo_ansible/roles/tripleo-hosts-entries/tasks/main.yml

@@ -62,6 +62,8 @@
   blockinfile:
     create: true
     path: "{{ tripleo_hosts_entries_hosts_path }}"
+    # BOF denotes the beginning of the file.
+    insertbefore: BOF
     block: "{{ tripleo_hosts_entries_block }}"
   tags:
     - tripleo_hosts_entries