ENT-992 Adjustments to enterprise enrollment query to include ecommerce data

Add basic Spark support

Use otto credentials for otto sqoop tasks.

Update unit and acceptance tests.

Created pull request template.

ENT-992:  Added additional fields in the analytics reports db

Merge pull request #504 from edx/zub/ENT-978-enterprise-enrollment-add-country-and-last-activity-date

ENT-978 Add user country code and last activity date in enterprise en…

Correcting coerced timestamp columns so that they do not use the default name

OEP implementation.

Disable overwrite_n_days in ExternalCourseEnrollmentPartitionTask.

ENT-1021 Fix data discrepancy for enterprise enrollment table

Update docker analyticstack information in README

The vertica version of the table had many more rows than the one in the result store,
and after investigating, it seems we were filtering out rows because of some joins
that should have been left joins.

Removed redundant test.

Find entitlements with matching course_uuid

Add docker analyticstack guides

Automatically cleanup containers after travis build finishes

Vertica Data Extract Using Sqoop

add support for docker devstack

Fix warehouse loading tasks.

* Align table field order with related test code
* Update expected result to match fixture spec

Changed User-location workflow to use user_id instead of username.

Use analytics pipeline official docker for travis tests