Fix closing and self-closing tags in templates

Void tags (e.g. <img>) couldn't have a closing tag (e.g. </img> is invalid). Non-void tags (e.g. <div>) couldn't be self closing (e.g. <div/> is invalid) and must be closed explicitly (e.g. with </div>). This CL fixes the tags which also prepares the templates for stricthtml which enforces it.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=168829028

java/google/registry/flows/soy/DomainCheckFeeEpp.soy

@@ -15,7 +15,7 @@
 {namespace registry.soy.api autoescape="strict"}
 
 /** Domain check fee request for one domain. */
-{template .domaincheckfee}
+{template .domaincheckfee stricthtml="false"}
 {@param domainName: string}
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">