remove unused import

Author: Vladimir Kotal

plugins/src/test/java/opengrok/auth/plugin/UserWhiteListPluginTest.java

@@ -40,7 +40,6 @@
 import java.io.FileOutputStream;
 import java.io.OutputStreamWriter;
 import java.nio.charset.StandardCharsets;
-import java.security.InvalidParameterException;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashMap;