[SPARK-3659] Set EC2 version to 1.1.0 and update version map

This brings the master branch in sync with branch-1.1

Author: Shivaram Venkataraman <shivaram@cs.berkeley.edu>

Closes #2510 from shivaram/spark-ec2-version and squashes the following commits:

bb0dd16 [Shivaram Venkataraman] Set EC2 version to 1.1.0 and update version map