Adds tests according to the CI wiki [0] specifically the standard test interface in the spec [1].

The playbook includes Tier1 level test cases that have been tested in the following contexts and is passing reliably on Fedora Rawhide: Atomic Host, Docker, and Classic.
Test logs are stored in the Artifacts directory.

The following steps are used to execute the tests using the standard test interface:

• Atomic
  sudo ANSIBLE_INVENTORY=$(test -e inventory && echo inventory || echo /usr/share/ansible/inventory) TEST_SUBJECTS=../atomic.qcow2 TEST_ARTIFACTS=$PWD/artifacts ansible-playbook --tags atomic tests.yml

• Docker
  sudo ANSIBLE_INVENTORY=$(test -e inventory && echo inventory || echo /usr/share/ansible/inventory) TEST_SUBJECTS=docker:docker.io/library/fedora:rawhide TEST_ARTIFACTS=$PWD/artifacts ansible-playbook --tags container tests.yml

• Classic
  sudo ANSIBLE_INVENTORY=$(test -e inventory && echo inventory || echo /usr/share/ansible/inventory) TEST_SUBJECTS="" TEST_ARTIFACTS=$PWD/artifacts ansible-playbook --tags classic tests.yml

[0] https://fedoraproject.org/wiki/CI
[1] https://fedoraproject.org/wiki/Changes/InvokingTests

Test Logs: (If you you would like a pointer to the complete log, I can include that as well)

• Atomic

  <snip>
  TASK [standard-test-beakerlib : Execute beakerlib tests] *****
  changed: [../atomic.qcow2] => (item=gettext-tests)

  TASK [standard-test-beakerlib : Make the master test summary log artifact] *
  changed: [../atomic.qcow2] => (item=gettext-tests)

  TASK [standard-test-beakerlib : Pull out the logs] *****
  changed: [../atomic.qcow2]

  TASK [standard-test-beakerlib : Check the results] *****
  changed: [../atomic.qcow2]

  PLAY [localhost] *********

  TASK [Gathering Facts] *********
  ok: [../atomic.qcow2]

  PLAY RECAP ***********
  ../atomic.qcow2 : ok=14 changed=9 unreachable=0 failed=0

  Test results:

  PASS gettext-tests

• Docker

  <snip>
  TASK [standard-test-beakerlib : Execute beakerlib tests] *****
  changed: [4db247a841a29d03d4fec3aeaf54b9648439064609996b7852a0c1e597b2f774] => (item=gettext-tests)

  TASK [standard-test-beakerlib : Make the master test summary log artifact] *
  changed: [4db247a841a29d03d4fec3aeaf54b9648439064609996b7852a0c1e597b2f774] => (item=gettext-tests)

  TASK [standard-test-beakerlib : Pull out the logs] *****
  changed: [4db247a841a29d03d4fec3aeaf54b9648439064609996b7852a0c1e597b2f774]

  TASK [standard-test-beakerlib : Check the results] *****
  changed: [4db247a841a29d03d4fec3aeaf54b9648439064609996b7852a0c1e597b2f774]

  PLAY RECAP ***********
  4db247a841a29d03d4fec3aeaf54b9648439064609996b7852a0c1e597b2f774 : ok=16 changed=11 unreachable=0 failed=0

  Test results:

  PASS gettext-tests

• Classic

  <snip>
  ==> default: TASK [standard-test-beakerlib : Execute beakerlib tests] ***
  ==> default: changed: [localhost] => (item=gettext-tests)
  ==> default:
  ==> default: TASK [standard-test-beakerlib : Make the master test summary log artifact] *
  ==> default: changed: [localhost] => (item=gettext-tests)
  ==> default:
  ==> default: TASK [standard-test-beakerlib : Pull out the logs] *****
  ==> default: changed: [localhost]
  ==> default:
  ==> default: TASK [standard-test-beakerlib : Check the results] *****
  ==> default: changed: [localhost]
  ==> default:
  ==> default: PLAY RECAP ***********
  ==> default: localhost : ok=16 changed=11 unreachable=0 failed=0
  ==> default: ++ '[' 0 -ne 0 ']'
  ==> default: ++ cat /root/gettext/artifacts/test.log
  ==> default: PASS gettext-tests