can't run ansible 2.8.0+ tests on ansible < 2.8.0

tests/ansible/integration/interpreter_discovery/ansible_2_8_tests.yml

@@ -6,6 +6,8 @@
   any_errors_fatal: true
   gather_facts: true
   tasks:
+    - name: can only run these tests on ansible >= 2.8.0
+      block:
         - name: ensure we can override ansible_python_interpreter
           vars:
             ansible_python_interpreter: overriddenpython
@@ -153,3 +155,4 @@
 
           always:
           - meta: clear_facts
+      when: ansible_version.full is version('2.8.0', '>=')