[ONOS-6695]supporting single quoted binary values

Change-Id: Icda3f064c5a2216938ae965d75151091f93ffda7
diff --git a/compiler/base/parser/src/test/resources/LeafSubStatementWhen.yang b/compiler/base/parser/src/test/resources/LeafSubStatementWhen.yang
index 239e0b6..f980763 100644
--- a/compiler/base/parser/src/test/resources/LeafSubStatementWhen.yang
+++ b/compiler/base/parser/src/test/resources/LeafSubStatementWhen.yang
@@ -3,7 +3,7 @@
     namespace http://huawei.com;
     prefix Ant;
     leaf ifType {
-        when "ifType != 'ethernet'" {
+        when "ifType != ethernet" {
             description "ifType is not ethernet";
         }
         type enumeration {