Disable C8 tests

ci/c8.yml

-c8_unman_physical:
-  extends: .test_unmanaged_physical
-  variables:
-    OS: 8
-    ARCH: x86_64
-  only:
-    variables:
-      - $TEST_OS8 == 'True' && $TEST_PHYSICAL == 'True' && $TEST_UNMANAGED == 'True'
-
-c8_unman_virtual:
-  extends: .test_unmanaged_virtual
-  variables:
-    OS: 8
-    ARCH: x86_64
-    DELETE_FAILURES: "False"
-  only:
-    variables:
-      - $TEST_OS8 == 'True' && $TEST_VIRTUAL == 'True' && $TEST_UNMANAGED == 'True'
-
-c8_puppet_physical:
-  extends: .test_puppet_physical
-  variables:
-    OS: 8
-    ARCH: x86_64
-  only:
-    variables:
-      - $TEST_OS8 == 'True' && $TEST_PHYSICAL == 'True' && $TEST_PUPPET == 'True'
-
-c8_puppet_virtual:
-  extends: .test_puppet_virtual
-  variables:
-    OS: 8
-    ARCH: x86_64
-  only:
-    variables:
-      - $TEST_OS8 == 'True' && $TEST_VIRTUAL == 'True' && $TEST_PUPPET == 'True'