Modify resourceUsage.Value() to resourceUsage.MilliValue()

[fancc]

I have a node with a CPU that can be allocated 3000m. I actually used 2015m. I set the threshold value to 70%. So my node has not reached this threshold, but I check the log and show that the CPU usage is 100% because When calculating usagePercentage, the Value() method is used, so here is the calculation of 3/3 as 100%, I think this may be misleading.

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[lixiang233]

resourceUsagePercentages is only used in logging, we should fix this though it won't affect the result.
/ok-to-test

[damemi]

/approve
/cc @ingvagabund

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This pull-request has been approved by: damemi, fancc

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[ingvagabund]

Right :)

// Value returns the unscaled value of q rounded up to the nearest integer away from 0.
func (q *Quantity) Value() int64

[ingvagabund]

/lgtm