Enhancements:
- exch: implement send quota
- logthru: add logfile support, add an close-open-cycle on SIGHUP
to facilitate external log rotation
Changes:
- mysql_adaptor: change default schema_upgrades action to "skip"
- exch: remove log_plugin service plugin
- exch: remove mod_proxy plugin
Fixes:
- midb: fix leftover debugging breakpoint infinite loop
- ldap_adaptor: fix null deref when LDAP server is away
- exmdb_provider: fix double-free on shutdown
- delivery: replace pthread_cancel calls, fixing a crash on shutdown