Include descriptive information on created resources

[dougtoppin]

When creating resources such as keys it is a good practice to include some descriptive information with them to make it easier to identify their intent later.

For example, when creating keys the description field can be set.

$ aws kms create-key --description "for awspics"

The alias value which appears on the kms console can also be set. This will appear on the KMS console in the list of keys.

$ aws kms create-alias --alias-name alias/awspics --target-key-id xxx