Fix imports

Author: philipwhiuk

quickfixj-core/src/main/java/quickfix/SessionState.java

@@ -20,7 +20,11 @@
 package quickfix;
 
 import java.io.IOException;
-import java.util.*;
+import java.util.Calendar;
+import java.util.Collection;
+import java.util.Date;
+import java.util.LinkedHashMap;
+import java.util.Map;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;