Fix leftover schema.sql issues.
Specify a temporary dir for the genotype worker

This is useful because the Postgres process in our deployment can't
access the e.g. /tmp dir Python writes tempfiles to by default. Now we
can specify where our intermediate CSV files are written to so that
postgres can read them.
Remove debug statement.
Merge pull request #242 from hammerlab/use-tmpfile-config-for-psql-copy

Use tmpfile config for psql copy