Fix all ACI examples to use delegate_to (#43439)

This is to avoid users connecting to the APIC using SSH, which is likely
to fail. In the ACI documentation (linked from every module) we go into
more details on how people are supposed to work with the modules..

lib/ansible/modules/network/aci/aci_contract.py

@@ -77,6 +77,7 @@ EXAMPLES = r'''
     description: Communication between web-servers and database
     scope: application-profile
     state: present
+  delegate_to: localhost
 
 - name: Remove an existing contract
   aci_contract:
@@ -86,6 +87,7 @@ EXAMPLES = r'''
     tenant: production
     contract: web_to_db
     state: absent
+  delegate_to: localhost
 
 - name: Query a specific contract
   aci_contract:
@@ -95,6 +97,8 @@ EXAMPLES = r'''
     tenant: production
     contract: web_to_db
     state: query
+  delegate_to: localhost
+  register: query_result
 
 - name: Query all contracts
   aci_contract:
@@ -102,6 +106,8 @@ EXAMPLES = r'''
     username: admin
     password: SomeSecretPassword
     state: query
+  delegate_to: localhost
+  register: query_result
 '''
 
 RETURN = r'''