Remove unused CollectionId parameter of RekognitionFacesPolicy

[53ningen]

Issue:
Fixes #974

Description of changes:
Removed unused CollectionId parameter of RekognitionFacesPolicy (policy template)

Description of how you validated changes:

• make test: passed all tests
• verified transformed template in the steps written in DEVELOPMENT_GUIDE

using this SAM template

# template.yaml
Resources:
  HogeFugaFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/hogefuga/
      Handler: app.lambda_handler
      Policies:
        - RekognitionFacesPolicy: {}

I executed the commands below:

aws cloudformation package --template-file MY_TEMPLATE_PATH/template.yaml --output-template-file output-template.yaml --s3-bucket MY_S3_BUCKET
bin/sam-translate.py --template-file=output-template.yaml

Then I got expected transformed template like this

...
          {
            "PolicyName": "HogeFugaFunctionRolePolicy1", 
            "PolicyDocument": {
              "Statement": [
                {
                  "Action": [
                    "rekognition:CompareFaces", 
                    "rekognition:DetectFaces"
                  ], 
                  "Resource": "*", 
                  "Effect": "Allow"
                }
              ]
            }
          }
...

Checklist:

• Write/update tests
• make pr passes
• Update documentation:
  • have to update this document when this pr merged.
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #985 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #985   +/-   ##
========================================
  Coverage    94.71%   94.71%           
========================================
  Files           69       69           
  Lines         3160     3160           
  Branches       606      606           
========================================
  Hits          2993     2993           
  Misses          85       85           
  Partials        82       82

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[jlhood]

Thanks for fixing this!