dtan4 / terraforming / 945

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Pull #410

travis-ci

feat: Filtering imported security groups by IDs

`terraforming sg` now accepts one or more security groups via `--group-ids sg-12345 sg-234456`.
This limits the tf output to include only the two security groups.

Similarly, `terraform sg --tfstate --group-ids sg-12345` limits the tfstate output to include only the security group.

An expected use-case to this flag is to gradually migrate hundreds of your security groups under the control of terraform, without worrying about the huge tf/tfstate diff on initial import.

Run `terraforming help sg` to see the description of the flag:

```
 bundle exec bin/terraforming help sg
Usage:
  terraforming sg

Options:
  [--group-ids=one two three]                    # Filter exported security groups by IDs
  [--merge=MERGE]                                # tfstate file to merge
  [--overwrite], [--no-overwrite]                # Overwrite existing tfstate
  [--tfstate], [--no-tfstate]                    # Generate tfstate
  [--profile=PROFILE]                            # AWS credentials profile
  [--region=REGION]                              # AWS region
  [--assume=ASSUME]                              # Role ARN to assume
  [--use-bundled-cert], [--no-use-bundled-cert]  # Use the bundled CA certificate from AWS SDK

Security Group
```

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