[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/utils/yangutils/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile1.yang b/utils/yangutils/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile1.yang
new file mode 100644
index 0000000..e78e583
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile1.yang
@@ -0,0 +1,26 @@
+module syslog1 {
+     yang-version 1;
+     namespace "http://huawei1.com";
+     prefix "sys1";
+
+     import "syslog2" {
+        prefix "sys2";
+     }
+
+     feature frr-te {
+       description "Indicates support for TE FastReroute (FRR)";
+       if-feature "sys2:p2mp-te";
+     }
+
+     container speed {
+         leaf local-storage-limit {
+             if-feature frr-te;
+             type uint64;
+             units "kilobyte";
+             config false;
+             description
+                     "The amount of local storage that can be
+                      used to hold syslog messages.";
+         }
+     }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile2.yang b/utils/yangutils/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile2.yang
new file mode 100644
index 0000000..199a6a6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile2.yang
@@ -0,0 +1,15 @@
+module syslog2 {
+     yang-version 1;
+     namespace "http://huawei2.com";
+     prefix "sys2";
+
+     import "syslog3" {
+        prefix "sys3";
+     }
+
+     feature p2mp-te {
+       description "Indicates support for P2MP-TE";
+       if-feature "sys3:extended-admin-groups";
+     }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile3.yang b/utils/yangutils/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile3.yang
new file mode 100644
index 0000000..f638139
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfilefeatureimportdependencyUndefined/featurefile3.yang
@@ -0,0 +1,5 @@
+module syslog3 {
+     yang-version 1;
+     namespace "http://huawei3.com";
+     prefix "sys3";
+}