Do not escape WHOIS output

Both WhoisAction and WhoisHttpAction set the HTTP response content type to "text/plain". There is no need to defensively escape the content. In fact, by escaping the content, it creates more problems down the line.

When used in a website, the response should be written into a DOM node by setting the textContent of the node, which automatically escapes the content.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=196743398

javatests/google/registry/whois/RegistrarWhoisResponseTest.java

@@ -103,7 +103,7 @@ public class RegistrarWhoisResponseTest {
             .build(),
         new RegistrarContact.Builder()
             .setParent(registrar)
-            .setName("John Geek")
+            .setName("Bonnie & Clyde")
             .setEmailAddress("johngeek@example-registrar.tld")
             .setPhoneNumber("+1.3105551215")
             .setFaxNumber("+1.3105551216")