Bug 30468: koha-mysql does not honor Koha's timezone setting

Bug 30468: koha-mysql does not honor Koha's timezone setting

If I run a query like "SELECT NOW()" from a koha report, I will get a different answer than if I had run it from koha-mysql.
In Koha, we set the timezone for each database connection.
However, koha-mysql does not do this, so instead we are left using the default timezone of the database.

Test Plan:
1) Set your time zone to something other than the database time zone
2) run "SELECT NOW()" using debian/scripts/koha-mysql
   *not* /usr/sbin/koha-mysql
3) Note you get the database timezone's current time
4) Apply this patch
5) Repeat step 2
6) Now you get the correct time!

Signed-off-by: Michal Urban <michalurban177@gmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>