Implement fetching of enabled features

Change-Id: I298a3ffeba4606bd0111460830e9ec60682e5f32
diff --git a/src/yang_schema.cpp b/src/yang_schema.cpp
index 1ac7a79..4c55b27 100644
--- a/src/yang_schema.cpp
+++ b/src/yang_schema.cpp
@@ -370,6 +370,11 @@
     m_context->load_module(moduleName.c_str());
 }
 
+void YangSchema::enableFeature(const std::string& moduleName, const std::string& featureName)
+{
+    m_context->get_module(moduleName.c_str())->feature_enable(featureName.c_str());
+}
+
 void YangSchema::registerModuleCallback(const std::function<std::string(const char*, const char*, const char*)>& clb)
 {
     auto lambda = [clb](const char* mod_name, const char* mod_revision, const char* submod_name, const char* submod_revision) {