Fixed compile error with imports after merge CTR
diff --git a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/ReservedKeysVerificationStrategy.java b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/ReservedKeysVerificationStrategy.java
index 28c59ca..9d0d25f 100644
--- a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/ReservedKeysVerificationStrategy.java
+++ b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/ReservedKeysVerificationStrategy.java
@@ -19,7 +19,6 @@
 package org.apache.tinkerpop.gremlin.process.traversal.strategy.verification;
 
 import org.apache.commons.configuration2.Configuration;
-import org.apache.commons.configuration.MapConfiguration;
 import org.apache.tinkerpop.gremlin.process.traversal.Step;
 import org.apache.tinkerpop.gremlin.process.traversal.Traversal;
 import org.apache.tinkerpop.gremlin.process.traversal.step.Parameterizing;
@@ -32,9 +31,7 @@
 
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.HashMap;
 import java.util.HashSet;
-import java.util.Map;
 import java.util.Set;
 import java.util.stream.Collectors;