ios_l2_interface (#35054)

* Fix sending 'None' to device on ios

* Add ios_l2_interface module & tests

* Skip l2 tests on non-l2 images

* Allow test to continue on non-L2 hosts

test/integration/targets/ios_l2_interface/tasks/cli.yaml

@@ -0,0 +1,24 @@
+---
+- name: collect all cli test cases
+  find:
+    paths: "{{ role_path }}/tests/cli"
+    patterns: "{{ testcase }}.yaml"
+  register: test_cases
+  delegate_to: localhost
+
+- name: set test_items
+  set_fact: test_items="{{ test_cases.files | map(attribute='path') | list }}"
+
+- name: run test cases (connection=network_cli)
+  include: "{{ test_case_to_run }}"
+  with_items: "{{ test_items }}"
+  loop_control:
+    loop_var: test_case_to_run
+
+- name: run test case (connection=local)
+  include: "{{ test_case_to_run }} ansible_connection=local"
+  with_first_found:
+    - files: "{{ test_items|default([]) }}"
+      skip: true
+  loop_control:
+    loop_var: test_case_to_run