Filter http2 headers

When using aggregation with http2, :authority headers were getting
forwarded to the client, which didn't know how to deal with them on
http1.

Filter all http2 headers.

Tested: Unit tests pass.

Change-Id: I6a834656b604004eeba1a2aa2f245ef211f28495
Signed-off-by: Ed Tanous <etanous@nvidia.com>
diff --git a/http/http2_connection.hpp b/http/http2_connection.hpp
index d394889..df41ff6 100644
--- a/http/http2_connection.hpp
+++ b/http/http2_connection.hpp
@@ -483,9 +483,11 @@
             }
             thisReq.method(verb);
         }
-        else if (nameSv == ":scheme")
+        else if (nameSv.starts_with(":"))
         {
-            // Nothing to check on scheme
+            // Ignore all other http2 headers
+            // :scheme and :authority are other valid http2 fields that might
+            // show up here.
         }
         else
         {