added additional flag for pyang and removed the unused file

Change-Id: Iee18b735bfbe02badaa675469a598c74895fb38e
diff --git a/Makefile b/Makefile
index f785a23..8517d19 100644
--- a/Makefile
+++ b/Makefile
@@ -35,5 +35,5 @@
 	pyang --lint ./config-models/aether-2.1.x/files/yang/*.yang
 	pyang --lint ./config-models/aether-2.2.x/files/yang/*.yang
 	pyang --lint ./config-models/aether-3.x/files/yang/*.yang
-	pyang --lint ./config-models/aether-4.x/files/yang/*.yang
-	pyang --lint ./config-models/plproxy-1.x/files/yang/*.yang
+	pyang --lint --lint-ensure-hyphenated-names -W error ./config-models/aether-4.x/files/yang/*.yang -p ./config-models/aether-4.x/files/yang
+	pyang --lint --lint-ensure-hyphenated-names -W error ./config-models/plproxy-1.x/files/yang/*.yang -p ./config-models/plproxy-1.x/files/yang