* describe_images is very slow if not filtered to owner accounts
*or* if the Owners parameter is passed (unless the Owners parameter
is `self`). Convert Owners parameters to `owner-id` and `owner-alias`
filters where possible. Tests with CLI show that `--owners self` is
fast, `--owners 123456789012` is slow (with or without owner-id filter).
* describe_image_attributes fails against accounts other than your
own. Launch permissions are useful information, but not critical.
* [ec2_ami_facts] new boto3-based module as a replacement for ec2_ami_find
- new boto3-based module to gather facts about ec2 images
- intended to replace ec2_ami_find which uses boto
- an ami find task (using new module) added to the ec2_ami integration test
* [ec2_ami_facts] Use AnsibleAWSModule. Catch BotoCoreError.
* add ec2_ami_facts alias to tests
* [ec2_ami_facts] return ami launch permissions as well