When running performance tests on read-only transaction execution, the node generated many errors of read_header: Connection reset by peer and didn't make additional progress.

Boost beast http session checks for http::error::end_of_stream || asio::error::connection_reset in on_read and executes do_eof() to shutdown the connection. on_read_header was checking for http::error::end_of_stream but not asio::error::connection_reset. This PR changes on_read_header to also check for asio::error::connection_reset.

Resolves #1661