Remove the MultiCV hack since it's become available

[vsedmik]

Problem Statement

MultiCV has become available in 6.17 via setting, no hacks are needed anymore.

Solution

Just remove the helper from mixins and fixture.

PRT test Cases example

trigger: test-robottelo pytest: tests/foreman/cli/test_host.py -k _multicv

[vsedmik]

trigger: test-robottelo pytest: tests/foreman/cli/test_host.py -k multi_cv

[Satellite-QE]

PRT Result

Build Number: 9326
Build Status: UNSTABLE
PRT Comment: pytest tests/foreman/cli/test_host.py -k multi_cv --external-logging
Test Result : ==== 2 passed, 88 deselected, 322 warnings, 6 errors in 1613.89s (0:26:53) =====

[jeremylenz]

PRT will fail until foreman_theme_satellite is released and in Stream.

[chris1984]

trigger: test-robottelo pytest: tests/foreman/cli/test_host.py -k multi_cv

[Satellite-QE]

PRT Result

Build Number: 9428
Build Status: UNSTABLE
PRT Comment: pytest tests/foreman/cli/test_host.py -k multi_cv --external-logging
Test Result : ==== 2 failed, 6 passed, 88 deselected, 454 warnings in 1865.23s (0:31:05) =====

[vsedmik]

Those 2 failures are one parametrized negative test case

test_negative_multi_cv_registration[rhel8-ipv4]
test_negative_multi_cv_registration[rhel9-ipv4]

failing here with Failed: DID NOT RAISE exception, which is expected since the setting has been exposed in 6.17

    # Verify that allow_multiple_content_views setting is not exposed
    with pytest.raises(CLIReturnCodeError):
        target_sat.cli.Settings.info({'name': 'allow_multiple_content_views'})

We should remove the assertion.

[vsedmik]

trigger: test-robottelo pytest: tests/foreman/cli/test_host.py -k multi_cv

[Satellite-QE]

PRT Result

Build Number: 9429
Build Status: SUCCESS
PRT Comment: pytest tests/foreman/cli/test_host.py -k multi_cv --external-logging
Test Result : ========= 8 passed, 88 deselected, 467 warnings in 1933.36s (0:32:13) ==========