Added a check to prevent that password protected ssl keys get saved. Thanks to Timo for finding the issue.

Fixed: Issue #3820 v3.1 Shell user wrong default Base Dir in GUI results to corrupt shell user home directory creation.

improved crojob

Fixed cron to update serial and not sign directly. This now issues a job for the cron server which will then generate the zone and sign it.
cleaner solution AND fixes a possible replication (zone-transfer) issue.

Fixed Open Issue #3789 php-fpm reload workaround targeted at Ubuntu 14.04 breaks newer/fixed PHP packages on Ubuntu 14.04

- Fixed mysql privilege reduction