Use hive serde jar from site's hive setup

The serde jar passed to the partitioner refers to an old, no longer
existing variant of the jar. But instead of bumping its version, we
remove passing it altogether, as the site configuration changed in the
meantime, and with this new configuration, hive correctly picks the
correct serde through the site configuration automatically.

Change-Id: I0c44d11c6dda1f515e84cd70e6daa35f52309a5a