[ONOS-4650][ONOS-4726][ONOS-4727] [ONOS-4728]Implement must parser + when parser + feature + if-feature + revision defect fix

Change-Id: I0a3aee6c1c6b72ef7da7f7f565fd0f149fe3fd42
diff --git a/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile3.yang b/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile3.yang
new file mode 100644
index 0000000..f638139
--- /dev/null
+++ b/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile3.yang
@@ -0,0 +1,5 @@
+module syslog3 {
+     yang-version 1;
+     namespace "http://huawei3.com";
+     prefix "sys3";
+}