The SSL/TLS session Id context is limited to 32 bytes. Instead of

The SSL/TLS session Id context is limited to 32 bytes.  Instead of
using the name of relayd relay or smtpd pki, use a 32 byte arc4random
buffer that should be unique for the context.  This fixes an issue in
OpenSMTPD when a long pki name could break the configuration.

OK gilles@ benno@