Added testcase for skip_ansible_lint capability.

There are 8 tasks to test:
1. checking ANSIBLE0004 works.
2. checking ANSIBLE0005 works.
3. checking ANSIBLE0006 works.
4. checking ANSIBLE0007 works.
5. checking ANSIBLE0004 skipped with tag "skip_ansible_lint".
6. checking ANSIBLE0005 skipped with tag "skip_ansible_lint".
7. checking ANSIBLE0006 skipped with tag "skip_ansible_lint".
8. checking ANSIBLE0007 skipped with tag "skip_ansible_lint".