Add generated interfaceaddtest.hpp to .gitignore

Change-Id: I66311c9ce86c1304df89b237424a966e115c73f5
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/src/test/.gitignore b/src/test/.gitignore
index c286eac..91e1c51 100644
--- a/src/test/.gitignore
+++ b/src/test/.gitignore
@@ -14,3 +14,4 @@
 /conditiongentest.hpp
 /conditiongentest
 /callbacktest
+/interfaceaddtest.hpp