Support Fn::ImportValue as distribution id

[mordka]

This PR adds support for distribution id specified as an intrinsic function Fn::ImportValue
Example:

      - preExistingCloudFront:
          distributionId:
            'Fn::ImportValue': 'CloudFront-SomeDistribution::CloudFrontID'

Currently this is not supported and the following error is returned upon deploy

Expected params.Id to be a string

[flonn]

As a workaround, @jgrumboe discovered that using outputs instead of exports work. https://www.serverless.com/framework/docs/providers/aws/guide/variables/#referencing-environment-variables

[brianantonelli]

Any chance of merging this down?

[horike37]

🎉 This PR is included in version 1.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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