MB-66512: Increase max frame size for unauthenticated clients...

... to 16k (a JWT may be up to 8k) and the default max
read size is 16k anyway

Change-Id: I7bca0bf312889413b0a874fe7abb367a67df69ca
Reviewed-on: https://review.couchbase.org/c/kv_engine/+/227058
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: Dan Owen <owend@couchbase.com>

Author: trondn

daemon/connection_libevent.cc

@@ -31,7 +31,7 @@
 /// consume memory on the server (for instance send everything except
 /// the last byte of a request and let the server be stuck waiting
 /// for the last byte of a 20MB command)
-static constexpr size_t MaxUnauthenticatedFrameSize = 1024;
+static constexpr size_t MaxUnauthenticatedFrameSize = 16 * 1024;
 
 LibeventConnection::LibeventConnection(SOCKET sfd,
                                        FrontEndThread& thr,