Fix for 147

relates to elastic#154

relates elastic#154

forward current hostname to backend1 and media manager app

Approved-by: Gideon Avida
Approved-by: Can Yildiz

🤖 ESQL: Merge upstream

Privilege escalation with dynamically included tasks in Ansible
(using `include_tasks`) is not consistent across versions.

Ansible version 2.7 and beyond [1] introduced `apply: \n  become: true`
but in Vagrant or old nightly nodes we may have to deal with base images
using a slightly older Ansible version (e.g. 2.5.x).

There is a version agnostic design pattern [2] utilizing block: to
properly inherit privilege escalation.

Apply block/become for dynamically included tasks in various fixtures.

[1] ansible/ansible#39236
[2] ansible/ansible#38129 (comment)