CI Updates + Length Fixes

• Fix prefix lengths to not be more than the 32 character limitation for some resources
• Update CI tests to use Terraform 0.13 and AWS provider 3.0
• Update environment variable for one of the tests as it's used for calculation of one of the deployment group names if one is not given so this should make it shorter to meet requirements
• Update tests to use master branch for external module references

AWS Provider Update

• Update main.tf to >= 2.7.0
• Update examples and tests to ~> 2.7 where applicable
• Fix linting issue
• Update tests to rebuild resources to avoid a test dep chain test failure
• Update readme with terraform 0.12 upgrade instructions

v0.12.0

Enhancements:

• add support for 0.12 configurations. Due to the underlying HCL differences, this version is not compatible with 0.11 configurations

v0.0.3

Enhancements:

• update external module references
• update for style guide conformity

Bugs

• Fix non functioning examples

v0.0.2

• New clb test
• Compatibility with latest testing container

v0.0.1

Merge pull request #1 from rackspace-infrastructure-automation/jct-in…