TUN-528: Move cloudflared into a separate repo

vendor/github.com/golang-collections/collections/queue/queue.go

@@ -0,0 +1,55 @@
+package queue
+
+type (
+	Queue struct {
+		start, end *node
+		length int
+	}
+	node struct {
+		value interface{}
+		next *node
+	}
+)
+
+// Create a new queue
+func New() *Queue {
+	return &Queue{nil,nil,0}
+}
+// Take the next item off the front of the queue
+func (this *Queue) Dequeue() interface{} {
+	if this.length == 0 {
+		return nil
+	}
+	n := this.start
+	if this.length == 1 {
+		this.start = nil
+		this.end = nil
+	} else {
+		this.start = this.start.next
+	}
+	this.length--
+	return n.value
+}
+// Put an item on the end of a queue
+func (this *Queue) Enqueue(value interface{}) {
+	n := &node{value,nil}
+	if this.length == 0 {
+		this.start = n
+		this.end = n		
+	} else {
+		this.end.next = n
+		this.end = n
+	}
+	this.length++
+}
+// Return the number of items in the queue
+func (this *Queue) Len() int {
+	return this.length
+}
+// Return the first item in the queue without removing it
+func (this *Queue) Peek() interface{} {
+	if this.length == 0 {
+		return nil
+	}
+	return this.start.value
+}