use ansible_host hostvar in inventory

[IlyesSemlali]

Issue Type

• Feature request

Molecule and Ansible details

ansible 2.8.6
  config file = None
  configured module search path = [u'/home/enedis/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /home/enedis/.venv/hdr-indus/lib/python2.7/site-packages/ansible
  executable location = /home/enedis/.venv/hdr-indus/bin/ansible
  python version = 2.7.16 (default, Apr 30 2019, 15:54:43) [GCC 9.0.1 20190312 (Red Hat 9.0.1-0.10)]


molecule, version 2.22

Molecule installation method : pip

Ansible installation method : pip

Desired Behavior

When using the docker driver for instance, the generated inventory looks like this :

elastic:
  hosts:
    elastic_1-500c8346-ba3e-4aaa-b4b5-f1c383847e06:
      ansible_connection: docker
    elastic_2-500c8346-ba3e-4aaa-b4b5-f1c383847e06:
      ansible_connection: docker
    elastic_3-500c8346-ba3e-4aaa-b4b5-f1c383847e06:
      ansible_connection: docker

When using the --parallel option, the instance name bares an UUID which leads to errors when fetching hostvars based on this name.
It could be easier to use parallelism with molecule if the inventory took advantage of the ansible_host variable like in the following inventory:

elastic:
  hosts:
    elastic_1:
      ansible_host: elastic_1-500c8346-ba3e-4aaa-b4b5-f1c383847e06:
      ansible_connection: docker