SplitVlanIds: vlan ID upper threshold is not verified

[bgartzi]

When checking different vlan trunk items, minID and maxID's upper thresholds are checked, ID's are not. Instead, minID is checked again.

id should be checked in this case.

ovs-cni/pkg/plugin/plugin.go

Lines 238 to 243 in 25cc08c

	if item.ID != nil {
	id = *item.ID
	if minID > 4096 {
	return nil, errors.New("incorrect trunk id parameter")
	}
	vlans[id] = true

Reported by gemini: #427 (comment)

[bgartzi]

I will provide a fix once #427 makes it through so as not to add up to the refactoring's complexity in the event of a rebase/conflicts.