Note - that exos_command module has been merged. You can use the devel branch of Ansible to use that today (install it from Github), or wait until Ansible 2.6 goes GA (ETA late June 2018)
To use Ansible with network devices, you need modules that work with that device. There are no EXOS Ansible modules in Ansible GA yet. A user has started a pull request to get some modules for EXOS added - see https://github.com/ansible/ansible/pull/37775.