coverage for lookup_list (#68683)

* coverage for lookup_list

Signed-off-by: Rick Elrod <rick@elrod.me>

test/integration/targets/lookup_list/aliases

@@ -0,0 +1,3 @@
+shippable/posix/group2
+skip/aix
+skip/python2.6  # lookups are controller only, and we no longer support Python 2.6 on the controller

test/integration/targets/lookup_list/tasks/main.yml

@@ -0,0 +1,19 @@
+- name: Set variables to verify lookup_list
+  set_fact: "{{ item if item is string else item[0] }}={{ item }}"
+  with_list:
+    - a
+    - [b, c]
+    - d
+
+- name: Verify lookup_list
+  assert:
+    that:
+        - a is defined
+        - b is defined
+        - c is not defined
+        - d is defined
+        - b is iterable and b is not string
+        - b|length == 2
+        - a == a
+        - b == ['b', 'c']
+        - d == d