Add test for vec<vec<T>> as a return value. am: 223b82a07d am: b364daa90e am: d43170e537

am: 6e9668b88e

Change-Id: Iba4193be1f8264f81bb43c39cf26bd53ad4b4f07

tests/foo/1.0/IFoo.hal

@@ -97,4 +97,6 @@ interface IFoo {
     transpose2(ThreeStrings[5] in) generates (FiveStrings[3] out);
 
     sendVec(vec<uint8_t> data) generates (vec<uint8_t> data);
+
+    sendVecVec() generates (vec<vec<uint8_t>> vecvec);
 };