Spring Added HTML close policy tag to control tag close style

This commit adds a new <spring:htmlClosePolicy> tag that can be used to specify how generated HTML tags are closed—XML style (/>) or HTML style (>). This is necessary to properly generate W3C validator-compliant HTML code.

Issue: SPR-10916

Comment From: pivotal-cla

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Comment From: rstoyanchev

Closing along with related issue.