run banner exec test only for NXOS7K (#29041)

Signed-off-by: Trishna Guha <trishnaguha17@gmail.com>

test/integration/targets/nxos_banner/tests/common/basic-exec.yaml

@@ -1,11 +1,14 @@
 ---
-- name: setup - remove exec
+- debug: msg="START nxos_banner exec test"
+
+- block:
+    - name: setup - remove exec
       nxos_banner:
         banner: exec
         state: absent
         provider: "{{ connection }}"
 
-- name: Set exec
+    - name: Set exec
       nxos_banner: &exec
         banner: exec
         text: |
@@ -16,20 +19,24 @@
         provider: "{{ connection }}"
       register: result
 
-- assert:
+    - assert:
         that:
           - "result.changed == true"
           - "'banner exec @\nthis is my exec banner\nthat has a multiline\nstring\n@' in result.commands"
 
-- name: Set exec again (idempotent)
+    - name: Set exec again (idempotent)
       nxos_banner: *exec
       register: result
 
-- assert:
+    - assert:
         that:
           - "result.changed == false"
           - "result.commands | length == 0"
 
+  when: platform | match("N7K")
+
+- debug: msg="END nxos_banner exec test"
+
 # FIXME add in tests for everything defined in docs
 # FIXME Test state:absent + test:
 # FIXME Without powers ensure "privileged mode required"