Fix enum name

Author: Zhen

driver/src/main/java/org/neo4j/driver/internal/metrics/InternalConnectionPoolMetrics.java

@@ -126,11 +126,11 @@ public PoolStatus poolStatus()
     {
         if ( pool.isOpen( address ) )
         {
-            return PoolStatus.Open;
+            return PoolStatus.OPEN;
         }
         else
         {
-            return PoolStatus.Closed;
+            return PoolStatus.CLOSED;
         }
     }
 

driver/src/main/java/org/neo4j/driver/internal/metrics/spi/PoolStatus.java

@@ -20,8 +20,8 @@
 
 public enum PoolStatus
 {
-    Open( 0 ),
-    Closed( 1 );
+    OPEN( 0 ),
+    CLOSED( 1 );
 
     private final int value;