Attempt to clear up nxos_mtu tests and documentation (#23361)

nxos_system wasn't added until 2.3, so nxos_mtu should have been deprecated
then.
(cherry picked from commit 98c23a3342)

lib/ansible/modules/network/nxos/_nxos_mtu.py

@@ -25,7 +25,7 @@ DOCUMENTATION = '''
 module: nxos_mtu
 extends_documentation_fragment: nxos
 version_added: "2.2"
-deprecated: Deprecated in 2.2 use M(nxos_system)'s C(mtu) option.
+deprecated: Deprecated in 2.3 use M(nxos_system)'s C(mtu) option.
 short_description: Manages MTU settings on Nexus switch.
 description:
     - Manages MTU settings on Nexus switch.
@@ -42,12 +42,12 @@ options:
         default: null
     mtu:
         description:
-            - MTU for a specific interface.
+            - MTU for a specific interface. Must be an even number between 576 and 9216.
         required: false
         default: null
     sysmtu:
         description:
-            - System jumbo MTU.
+            - System jumbo MTU. Must be an even number between 576 and 9216.
         required: false
         default: null
     state:

test/integration/targets/nxos_mtu/tests/cli/set_mtu.yaml

@@ -32,29 +32,19 @@
     that:
       - "result.changed == false"
 
-- name: configure interface mtu
+- name: configure invalid (odd) interface mtu
-  nxos_mtu:
-    interface: Ethernet3/1
-    mtu: 2001
-    provider: "{{ cli }}"
-  register: result
-
-- assert:
-    that:
-      - "result.changed == true"
-
-- name: verify interface mtu
   nxos_mtu:
     interface: Ethernet3/1
     mtu: 2001
     provider: "{{ cli }}"
   register: result
+  ignore_errors: yes
 
 - assert:
     that:
-      - "result.changed == false"
+      - "result.failed == true"
 
-- name: invalid mtu setting
+- name: configure invalid (large) mtu setting
   nxos_mtu:
     interface: Ethernet3/1
     mtu: 100000

test/integration/targets/nxos_mtu/tests/cli/set_sysmtu.yaml

@@ -11,7 +11,6 @@
   nxos_mtu:
     sysmtu: 2000
     provider: "{{ cli }}"
-    transport: nxapi
   register: result
 
 - assert:
@@ -28,29 +27,20 @@
     that:
       - "result.changed == false"
 
-- name: update system mtu
+- name: configure invalid (odd) system mtu
-  nxos_mtu:
-    sysmtu: 2001
-    provider: "{{ cli }}"
-  register: result
-
-- assert:
-    that:
-      - "result.changed == true"
-
-- name: verify system mtu
   nxos_mtu:
     sysmtu: 2001
     provider: "{{ cli }}"
   register: result
+  ignore_errors: yes
 
 - assert:
     that:
-      - "result.changed == false"
+      - "result.failed == true"
 
-- name: invalid setting
+- name: configure invalid (large) system mtu setting
   nxos_mtu:
-    sysmtu: 3000
+    sysmtu: 10000
     provider: "{{ cli }}"
   register: result
   ignore_errors: yes

test/integration/targets/nxos_mtu/tests/nxapi/set_mtu.yaml

@@ -32,29 +32,19 @@
     that:
       - "result.changed == false"
 
-- name: configure interface mtu
+- name: configure invalid (odd) interface mtu
-  nxos_mtu:
-    interface: Ethernet3/1
-    mtu: 2001
-    provider: "{{ nxapi }}"
-  register: result
-
-- assert:
-    that:
-      - "result.changed == true"
-
-- name: verify interface mtu
   nxos_mtu:
     interface: Ethernet3/1
     mtu: 2001
     provider: "{{ nxapi }}"
   register: result
+  ignore_errors: yes
 
 - assert:
     that:
-      - "result.changed == false"
+      - "result.failed == true"
 
-- name: invalid mtu setting
+- name: configure invalid (large) mtu setting
   nxos_mtu:
     interface: Ethernet3/1
     mtu: 100000

test/integration/targets/nxos_mtu/tests/nxapi/set_sysmtu.yaml

@@ -27,29 +27,20 @@
     that:
       - "result.changed == false"
 
-- name: update system mtu
+- name: configure invalid (odd) system mtu
-  nxos_mtu:
-    sysmtu: 2001
-    provider: "{{ nxapi }}"
-  register: result
-
-- assert:
-    that:
-      - "result.changed == true"
-
-- name: verify system mtu
   nxos_mtu:
     sysmtu: 2001
     provider: "{{ nxapi }}"
   register: result
+  ignore_errors: yes
 
 - assert:
     that:
-      - "result.changed == false"
+      - "result.failed == true"
 
-- name: invalid setting
+- name: configure invalid (large) system mtu setting
   nxos_mtu:
-    sysmtu: 3000
+    sysmtu: 10000
     provider: "{{ nxapi }}"
   register: result
   ignore_errors: yes