the docker centos7 image has already installed epel (travis-ci)

[daswars]

the docker centos7 image has already installed epel. Therefore, travis-ci does not check the playbook and idempotence correctly.

https://travis-ci.org/geerlingguy/ansible-role-repo-epel/jobs/244234385

Checking Ansible playbook syntax.
playbook: /etc/ansible/roles/role_under_test/tests/test.yml
Running command: docker exec 1497798189 env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/test.yml
PLAY [all] *********************************************************************
TASK [Gathering Facts] *********************************************************
ok: [localhost]
TASK [role_under_test : Check if EPEL repo is already configured.] *************
ok: [localhost]
TASK [role_under_test : Install EPEL repo.] ************************************
skipping: [localhost]
TASK [role_under_test : Import EPEL GPG key.] **********************************
skipping: [localhost]
PLAY RECAP *********************************************************************
localhost : ok=2 changed=0 unreachable=0 failed=0