Util: Consolidate dup BandwidthEstimator interfaces

core/java/src/net/i2p/util/BandwidthEstimator.java

@@ -0,0 +1,20 @@
+package net.i2p.util;
+
+/**
+ *  A Westwood bandwidth estimator
+ *
+ *  @since 0.9.46 consolidated from streaming and udp in 0.9.50
+ */
+public interface BandwidthEstimator {
+
+    /**
+     * Records an arriving ack.
+     * @param acked how many bytes or packets were acked with this ack
+     */
+    public void addSample(int acked);
+
+    /**
+     * @return the current bandwidth estimate in bytes/ms or packets/ms.
+     */
+    public float getBandwidthEstimate();
+}