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/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/SecurityGroup.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/SecurityGroup.java
index 9ec1dc6..33ddcbf 100644
--- a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/SecurityGroup.java
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/SecurityGroup.java
@@ -52,7 +52,7 @@
 
     @Override
     public int hashCode() {
-        return Objects.hash(securityGroup);
+        return securityGroup.hashCode();
     }
 
     @Override