Method to set dask config path

I'm using dask distributed on an HPC cluster that makes $HOME not writable from batch jobs (can only write to a Scratch space). Ran into failures where dask tried to initialize its config from a job. The solution is to simply change where dask stores its config, currently it's hardcoded to the user home. IPython parallel and jupyter let you set environment variables to override the defaults which seems to work fine.