Create a script for running mozetl jobs on databricks

[acmiyaguchi]

This script runs jobs registered with mozetl.cli using the databricks rest api.

Here are a couple of examples of running a fork of this repo to run jobs. The jobs will show up in the Clusters page. Clicking on Go To Job Run will contain the same id as the one in the logs.

python mozetl-databricks.py \
	--git-path https://github.com/acmiyaguchi/python_mozetl.git \
	--git-branch python3-part2 \
	--python 3 \
	--num-workers 5 \
	--token <TOKEN>  \
	churn \
		--start_date 20181201 \
		--bucket telemetry-test-bucket \
		--period 3 \
		--slack 1 \
		--sample

python mozetl-databricks.py \
	--git-path https://github.com/acmiyaguchi/python_mozetl.git \
	--git-branch python3-part2 \
        --python 3 \
        --num-workers 5 \
	--token <TOKEN> \
	search_clients_daily  \
		--submission_date 20181202 \
		--bucket telemetry-test-bucket \
		--prefix test_search

[akkomar]

Nice, that's useful!
I'd add one of these example calls somewhere in the repo (either readme or as a comment in the script).

[acmiyaguchi]

I'll add the documentation in a follow-up PR, since I should add instructions for the mozetl-submit.sh script too.