Drop unneeded partition dropping part of oozie import

As dropping partitions is handled differently in refinery, the scripts
for it are not needed. Also, the path names are still focused on the
precursor of refinery. Furthermore, SerDe handling has been
simplified.

Note that the part for adding partitions is currently not working
either. We keep it around nonetheless, as follow-up commits will bring
it into shape.

Bug: 67128
Change-Id: I60f5ce894a1a8d69a599b6f5b3a788c9859b555e
Drop unneeded auxpaths for hive snippets

By removing the auxpaths, we are less dependent on deployed SerDe
version. Hive now picks up the deployed SerDe automatically.

Change-Id: If58c49e069c20e3c160a8fcc88678ced6fc40f92
Merge "Drop unneeded partition dropping part of oozie import"