j4ckstraw

fix #459

> @j4ckstraw Could you please add a unit test for this fix? Let me try

> @j4ckstraw any progress with this PR? sorry, I am busy recently. BYW, Is it really need a test?

I have a problem when try to write a test for this function. I know that if the path which stat call is not found, the Walk function will return...

> @j4ckstraw have you joined our DingTalk or WeChat group? I would like to discuss further cooperation with you~ Not yet, It would be my pleasure.

> > Not yet, It would be my pleasure. > > Nice! You can find our DingTalk QR Code in [README](https://github.com/koordinator-sh/koordinator#community) Got it, I have joined in it.

can goldpinger split nodes into zones?

reference https://github.com/kubernetes/kubernetes/blob/d61cbac69aae97db1839bd2e0e86d68f26b353a7/test/integration/evictions/evictions_test.go#L126C5-L127C13

maybe `Allocatable[Mid]' := min(Reclaimable[Mid] + Unallocated[Mid], NodeAllocatable * thresholdRatio)` is better than `Allocatable[Mid]' := min(Reclaimable[Mid], NodeAllocatable * thresholdRatio) + Unallocated[Mid]`

#1762