Replaced Stream#forEach() with Collection#forEach()

And also replaced comparators to Compatator#comparing

Change-Id: I3759a872ee65ad6a4c660aa74ab893b67891c50f
diff --git a/src/main/java/org/opencord/cordvtn/impl/InstanceManager.java b/src/main/java/org/opencord/cordvtn/impl/InstanceManager.java
index b31a575..80f21ee 100644
--- a/src/main/java/org/opencord/cordvtn/impl/InstanceManager.java
+++ b/src/main/java/org/opencord/cordvtn/impl/InstanceManager.java
@@ -203,10 +203,9 @@
 
     @Override
     public void removeInstance(ConnectPoint connectPoint) {
-        hostService.getConnectedHosts(connectPoint).stream()
-                .forEach(host -> {
-                    hostProvider.hostVanished(host.id());
-                });
+        hostService.getConnectedHosts(connectPoint).forEach(host -> {
+            hostProvider.hostVanished(host.id());
+        });
     }
 
     @Override