Fix includes

Our includes haven't been enforced by tidy in a while.  Run the script,
check in the result, minus the false positives.

Change-Id: I6a6da26f5ba5082d9b4aa17cdc9f55ebd8cd41a6
Signed-off-by: Ed Tanous <etanous@nvidia.com>
diff --git a/http/http2_connection.hpp b/http/http2_connection.hpp
index 4e3da8e..efd9225 100644
--- a/http/http2_connection.hpp
+++ b/http/http2_connection.hpp
@@ -15,6 +15,7 @@
 
 // NOLINTNEXTLINE(misc-include-cleaner)
 #include "nghttp2_adapters.hpp"
+#include "sessions.hpp"
 
 #include <nghttp2/nghttp2.h>
 #include <unistd.h>