Search all assigned ipv6 addresses instead of just the first (#40533)

* Search all assigned ipv6 addresses instead of just the first

* Add test for idempotency with multiple ipv6 addresses assigned

test/integration/targets/ios_l3_interface/tests/cli/basic.yaml

@@ -41,7 +41,7 @@
     provider: "{{ cli }}"
   register: result
 
-- assert:
+- assert: &unchanged
     that:
       - 'result.changed == false'
 
@@ -74,7 +74,7 @@
       - '"ip address dhcp" in result.commands'
 
 - name: Configure interface ipv6 address
-  ios_l3_interface:
+  ios_l3_interface: &ipv6-1
     name: "{{ test_interface }}"
     ipv6: fd5d:12c9:2201:1::1/64
     state: present
@@ -88,16 +88,36 @@
       - '"ipv6 address fd5d:12c9:2201:1::1/64" in result.commands'
 
 - name: Configure interface ipv6 address (idempotent)
-  ios_l3_interface:
+  ios_l3_interface: *ipv6-1
+  register: result
+
+- assert: *unchanged
+
+- name: Configure second ipv6 address on interface
+  ios_l3_interface: &ipv6-2
     name: "{{ test_interface }}"
-    ipv6: fd5d:12c9:2201:1::1/64
+    ipv6: fd5d:12c9:2291:1::1/64
     state: present
     provider: "{{ cli }}"
   register: result
 
 - assert:
     that:
-      - 'result.changed == false'
+      - 'result.changed == true'
+      - '"interface {{ test_interface }}" in result.commands'
+      - '"ipv6 address fd5d:12c9:2291:1::1/64" in result.commands'
+
+- name: Ensure first ipv6 address still associated with interface
+  ios_l3_interface: *ipv6-1
+  register: result
+
+- assert: *unchanged
+
+- name: Ensure second ipv6 address still associated with interface
+  ios_l3_interface: *ipv6-2
+  register: result
+
+- assert: *unchanged
 
 - name: Assign same ipv6 address to other interface (fail)
   ios_l3_interface:
@@ -181,9 +201,7 @@
     provider: "{{ cli }}"
   register: result
 
-- assert:
-    that:
-      - 'result.changed == false'
+- assert: *unchanged
 
 - name:  Change ipv4 and ipv6 address using aggregate
   ios_l3_interface:
@@ -232,8 +250,6 @@
     provider: "{{ cli }}"
   register: result
 
-- assert:
-    that:
-      - 'result.changed == false'
+- assert: *unchanged
 
 - debug: msg="END ios_l3_interface cli/basic.yaml on connection={{ ansible_connection }}"