tools: acrnctl: Free vmmngr list after vm ops done

vmmngr_struct entry is allocated in get_vm_list. we should free it after vm ops done.

Signed-off-by: Kaige Fu <kaige.fu@intel.com>
Reviewed-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
Reviewed-by: Yan, Like <like.yan@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

tools/acrn-manager/acrnctl.h

@@ -34,6 +34,11 @@ static const char *state_str[] = {
  */
 void get_vm_list(void);
 
+/**
+ * @brief free all vmmngr_struct allocated by get_vm_list
+ */
+void put_vm_list(void);
+
 /**
  * @brief search vm indentified by vm from vmmngr_head
  *