Avoid use of Objects.hash when there's only 1 params

- directly call #hashCode() when hashed Object seems non-null
- replace with Objects.hashCode(Object) when Nullable
- replace with Long.hashCode(long), etc. when primitive

Change-Id: I08c24ebbe94cf4162d1491209a14baf953163e41
diff --git a/src/main/java/org/onosproject/segmentrouting/DefaultTunnel.java b/src/main/java/org/onosproject/segmentrouting/DefaultTunnel.java
index 8c6fbe8..7016143 100644
--- a/src/main/java/org/onosproject/segmentrouting/DefaultTunnel.java
+++ b/src/main/java/org/onosproject/segmentrouting/DefaultTunnel.java
@@ -17,8 +17,6 @@
 package org.onosproject.segmentrouting;
 
 import java.util.List;
-import java.util.Objects;
-
 import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
@@ -96,7 +94,7 @@
 
     @Override
     public int hashCode() {
-        return Objects.hash(labelIds);
+        return labelIds.hashCode();
     }
 
     @Override