Spring SPR-17600 Vararg based methods in MessageSource

It adds a vararg based getMessage methods in MessageSource. The methods are added using Java 8 Interface Default Methods so doesn't need any implementation in any concrete MessageSource.

Comment From: ankurpathak

Pull request for Jira issue: https://jira.spring.io/browse/SPR-17600

Comment From: ankurpathak

Any update on this issue??

Comment From: ankurpathak

@jhoeller Can we merge it as it will make useing MessageSource much more elegant.

Comment From: ankurpathak

@jhoeller Can you please review this request, as its a long pending issue.

Comment From: bclozel

I don't think we should add those variants as it will make IDE auto-completion noisy. Thanks!