lib-master: Add log_debug setting lib-master understands only the global log_debug setting, which is passed to it via environment from master process, or alternatively via doveconf when executing standalone programs. Any per-user log_debug settings need to be handled explicitly elsewhere.

lib-master: Added master_service_get_process_min_avail()

lib-master: Send service's idle_kill value to process in environment.

master process now tells its children their service's process_limit.

Added import_environment setting. This also cleans up different places in code where TZ and other environments are preserved. If it's not in the import_environment setting, it's not preserved.

master-child API change: Use a separate fd for tracking when master dies. This works around a Linux performance problem where when one process writes to status fd all the other processes of the same service type wake up.

"Running standalone?" check now uses a new DOVECOT_CHILD_PROCESS environment rather than GENERATION. The GENERATION environment was already set in some systems for Java.

auth/login related timeouts are now in one place and they make more sense. Most importantly now auth client doesn't abort lookup before server does. --HG-- branch : HEAD

anvil: After master gets a SIGHUP, start logging via new log process. --HG-- branch : HEAD

Redesigned how login process passes connections to mail processes and changed related APIs. Master process is no longer in the middle. --HG-- branch : HEAD

auth: Identify clients using a 128bit random cookie on top of the existing PID. When master is finishing the login, it must give this cookie to REQUEST command and it must match what auth process knows. This change makes it safe to do client/master login without a dedicated master process. --HG-- branch : HEAD

struct log_service_handshake: Removed unused max_lines_per_sec. --HG-- branch : HEAD

*-login: Fixed dropping oldest connection when reaching all limits. --HG-- branch : HEAD

dovecot -p: And fixed it to really work this time. --HG-- branch : HEAD

Added service_count setting to limit how many requests a service can handle before dying. --HG-- branch : HEAD

*-login: Allow auth input to be larger than the rest of the input. --HG-- branch : HEAD

Implemented anvil service, which is used to implement mail_max_userip_connections. --HG-- branch : HEAD

master: Fixes to handling logging. Master now has a non-blocking write pipe to log process, so it no longer blocks if log process is hanging. Also it's cleaner to send log commands via a pipe specifically meant for them. --HG-- branch : HEAD

Initial commit for v2.0 master rewrite. Several features are still missing. --HG-- branch : HEAD