Add a number of fixes for bugs reported upstream
- Avoid spinning proftpd process if read(2) returns EAGAIN (bug 3639)
- SITE CPFR/CPTO does not update quota tally (bug 3641)
- Segfault in mod_sql_mysql if "SQLAuthenticate groupsetfast" used (bug 3642)
- Disable signal handling for exiting session processes (bug 3644)
- Ensure that SQLNamedConnectInfos with PERSESSION connection policies are
opened before chroot (bug 3645)
- MaxStoreFileSize can be bypassed using REST/APPE (bug 3649)
- Fix TCPAccessSyslogLevel directive (bug 3652)
- Segfault with "DefaultServer off" and no matching server for incoming IP
address (bug 3653)