These functions can be used within various EC2 data sources to support
querying by filter. The following cases are supported:
- Filtering by exact equality with single attribute values
- Filtering by EC2 tag key/value pairs
- Explicitly specifying raw EC2 filters in config
This should cover most of the filter use-cases for Terraform data
sources that are built on EC2's 'Describe...' family of functions.
James Bardin