UI: sliders for CPU and memory specifications of VMs

Good afternoon, if you create a Service Offering with Custom constrained or Custom unconstrained, where you specified CPU and Memory limits. For example, in Custom constrained I specified minCPU:1 and MaxCPU:40. I created a user user1, where I set CPU limit:7 for him.
It would be nice when the user selects Service offering - he could only choose between 1 and the specified limit (CPU limit). It would be nice if he moves the slider he could only choose a value between 1 and user CPU Limit.
Is it possible ?

从用户选择 Service Offering 的 VM 创建流程开始，然后跟踪 offering 的 CPU 和内存限制如何暴露给 UI。定义受限和不受限自定义 offering 的行为，包括用户的 CPU 限制；当两个滑块都阻止取值超出允许范围，并且相关测试覆盖了该行为时，即视为完成。

由索引模型根据 Issue 内容生成。