refactor(bootstrap): nest network fields under system.network to match main project schema

roles/virtualization/tasks/vmware.yml

@@ -54,9 +54,9 @@
           } ] if rhel_iso is defined and rhel_iso | length > 0 else [] )
       }}
     networks:
-      - name: "{{ system_cfg.network }}"
+      - name: "{{ system_cfg.network.bridge }}"
         type: dhcp
-        vlan: "{{ system_cfg.vlan if system_cfg.vlan is defined and system_cfg.vlan | string | length > 0 else omit }}"
+        vlan: "{{ system_cfg.network.vlan if system_cfg.network.vlan is defined and system_cfg.network.vlan | string | length > 0 else omit }}"
   register: virtualization_vmware_create_result
 
 - name: Set VM created fact when VM was powered on during creation