Return EOS/success for failed proxy TLS connections only on handshake
Return EOS/success for failed proxy TLS connections only on handshake

This prevents mod_proxy_h2 from endlessly looping while trying to send
error messages to the peer after a failed handshake.

airtower-luna/mod_gnutls,airtower-luna/mod_gnutls,airtower-luna/mod_gnutls