Provide a configuration property for endpoints' CORS origin patterns

[pedivo]

When the CorsConfiguration is configured to allow credentials you cannot use wildcards on the allowedOrigins attribute.
The CorsConfiguration itself asks to use the allowedOriginPatterns when do you want to use wildcards and allow credentials at the same time.

However, there isn't a way to configure the allowedOriginPatterns on the CorsEndpointProperties.

I've just added the possibility to configure the allowedOriginPatterns on the CorsEndpointProperties.

[pivotal-issuemaster]

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[pivotal-issuemaster]

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[wilkinsona]

Closed by 847bb62 (unfortunately, I typo'd the issue reference).

@pedivo Thanks very much for making your first contribution to Spring Boot.