- Remove use of touch and chmod.
 - Restrict usage of chown to cases where target directory is /var/log.
 - Due to limited feature set in /bin/sh on Solaris, /bin/bash will be
   used on this platform.
 - Give error if directory for UNIX socket file is missing.
 - Privileged user should not log to files owned by different user
   (mysqld will log as before).