mod_ssl: performing protocol switch directly after ALPN selection, mod_http2:...

mod_ssl: performing protocol switch directly after ALPN selection, mod_http2: connection hook inits network filters to force TLS handshake, reads input only if H2Direct explicitly enabled, changes H2Direct default to off even for cleartext connections

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1708107 13f79535-47bb-0310-9956-ffa450edef68