Add Carriage Return in WHOIS disclaimer text

WHOIS disclaimer is read from the config yaml file directly and the line breaks
within the text does not contain carriage return, which ICANN requires. This
CL fixes the non-compliance.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=156359526

javatests/google/registry/whois/WhoisHttpServerTest.java

@@ -80,7 +80,8 @@ public class WhoisHttpServerTest {
     whoisServer.whoisReader = new WhoisReader(new WhoisCommandFactory());
     whoisServer.whoisMetrics = new WhoisMetrics();
     whoisServer.metricBuilder = WhoisMetric.builderForRequest(clock);
-    whoisServer.disclaimer = "Doodle Disclaimer";
+    whoisServer.disclaimer =
+        "Doodle Disclaimer\nI exist so that carriage return\nin disclaimer can be tested.";
     return whoisServer;
   }