Add support for deploying on EC2

Add limited support for running Hive Metastore in EC2. (#114)

* add instance_type variable and logic to disable ecs specific resources

* configure hive metastore on EC2 instances

* lambda to update hive db locations

* configure using SSM

* configure SNS event listener on EC2 nodes

* terraform fmt

* update changelog

* update variable.md

* PR comment updates

* PR comment updates

* add iam_name_root variable

* update iam role policy resource names

* add Name tag to S3 bucket

* update changelog