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: Classic.
Test logs are stored in the Artifacts directory.

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

• 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)

All tests were executed on Fedora Rawhide
* Classic

<snip>
TASK [standard-test-basic : Execute tests] **************
changed: [localhost] => (item={'install_stqe': {'dir': 'python-stqe', 'run': 'python3 setup.py install'}})
changed: [localhost] => (item={'iscsi-initiator-utils': {'dir': './', 'run': 'stqe-test run -t iscsi/iscsi_params.py'}})

TASK [standard-test-basic : Check the results] **************
changed: [localhost]

TASK [standard-test-basic : Set role result] **************
ok: [localhost]

TASK [include_role : str-common-final] **************

TASK [str-common-final : Pull out the logs from test environment to test runner] **************
changed: [localhost]

TASK [str-common-final : Report role result] **************
ok: [localhost] => {
    "msg": [
        "Tests failed: False",
        "Tests msg: ",
        ""
    ]
}

PLAY RECAP **************
localhost                  : ok=20   changed=9    unreachable=0    failed=0

$ cat artifacts/test.log 
PASS install_stqe
PASS iscsi-initiator-utils