fix include names

cppcheck isn't smart enough to recognize these are c++ headers, not c
headers.  Considering we're already inconsistent about our naming, it's
easier to just be consistent, and move the last few files to use .hpp
instead of .h.

Tested:
Code builds, no changes.

Signed-off-by: Ed Tanous <ed@tanous.net>
Change-Id: Ic348d695f8527fa4a0ded53f433e1558c319db40
diff --git a/http/ut/utility_test.cpp b/http/ut/utility_test.cpp
index 0f40756..a81adf5 100644
--- a/http/ut/utility_test.cpp
+++ b/http/ut/utility_test.cpp
@@ -1,4 +1,4 @@
-#include "utility.h"
+#include "utility.hpp"
 
 #include "gmock/gmock.h"