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_vlan_pool.py

@@ -58,6 +58,7 @@ EXAMPLES = r'''
     pool_allocation_mode: dynamic
     description: Production VLANs
     state: present
+  delegate_to: localhost
 
 - name: Remove a VLAN pool
   aci_vlan_pool:
@@ -67,6 +68,7 @@ EXAMPLES = r'''
     pool: production
     pool_allocation_mode: dynamic
     state: absent
+  delegate_to: localhost
 
 - name: Query a VLAN pool
   aci_vlan_pool:
@@ -76,6 +78,8 @@ EXAMPLES = r'''
     pool: production
     pool_allocation_mode: dynamic
     state: query
+  delegate_to: localhost
+  register: query_result
 
 - name: Query all VLAN pools
   aci_vlan_pool:
@@ -83,6 +87,8 @@ EXAMPLES = r'''
     username: admin
     password: SomeSecretPassword
     state: query
+  delegate_to: localhost
+  register: query_result
 '''
 
 RETURN = r'''