Remove CloudFront from some class names

[phobologic]

It's just ATM, not ATM Machine. :)

[markpeek]

Not sure I agree with this change. According to the CF specification, it lists those with "CloudFront". Here's what the auto-generator produces:

class CloudFrontOriginAccessIdentityConfig(AWSProperty):
    props = {
        'Comment': (basestring, True),
    }


class CloudFrontOriginAccessIdentity(AWSObject):
    resource_type = "AWS::CloudFront::CloudFrontOriginAccessIdentity"

    props = {
        'CloudFrontOriginAccessIdentityConfig':
            (CloudFrontOriginAccessIdentityConfig, True),
    }