[ONOS-4636]YANG Grouping linking bug fix + YANG Code review comment fix

Change-Id: I68ee8dd08266a02593e217cef1a9bb010037d673
diff --git a/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PatternRestrictionListenerTest.java b/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PatternRestrictionListenerTest.java
index 69c4452..5216ef3 100644
--- a/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PatternRestrictionListenerTest.java
+++ b/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PatternRestrictionListenerTest.java
@@ -18,6 +18,7 @@
 
 import java.io.IOException;
 import java.util.ListIterator;
+
 import org.junit.Test;
 import org.onosproject.yangutils.datamodel.YangDataTypes;
 import org.onosproject.yangutils.datamodel.YangLeaf;