This reverts commit 00ccb27d.

MDEV-6449 was fixed in version 10.0.14
Note however that TokuDB remains automatically disabled when building MariaDB
with GCC < 4.7

For NEO, TokuDB seems to be a better choice than InnoDB.

Forgot to update parameter schema.

One thread is just too limited to produce a usable instance (for example,
a single-zope setup with default thread count fails to run live tests). It
is also not an advised setting for activity nodes, because of timerserver
still queuing process_timer calls while CMFActivity is busy processing; the
result being a (limited) waste of memory, and hammering mysql after long
processing periods.
Zope's default value must be duplicated because thread-amount is also used
to generate haproxy configuration file (so just not providing the value in
Zope's configuration file is wrong).

Compatibility with runner config is to be checked