## What changes were proposed in this pull request?

A discussed in SPARK-19606, the addition of a new config property named "spark.mesos.constraints.driver" for constraining drivers running on a Mesos cluster

## How was this patch tested?

Corresponding unit test added also tested locally on a Mesos cluster

Please review http://spark.apache.org/contributing.html before opening a pull request.

Author: Paul Mackles <pmackles@adobe.com>

Closes #19543 from pmackles/SPARK-19606.