Add SDEvent delegate

Add an sd-event interface abstraction to facilitate
mocking and unit test.

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Change-Id: I5880617565fc6eab54335adc30033d4b132568f8
diff --git a/src/templates/generated.mako.hpp b/src/templates/generated.mako.hpp
index 9e89983..914b065 100644
--- a/src/templates/generated.mako.hpp
+++ b/src/templates/generated.mako.hpp
@@ -10,6 +10,7 @@
 #include "method.hpp"
 #include "propertywatchimpl.hpp"
 #include "sdbusplus.hpp"
+#include "sdevent.hpp"
 
 using namespace std::string_literals;