RDAP: Document RDAP guidance

Updates the RDAP code to reflect guidance and confirmation received from various mailing lists.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129254894

javatests/google/registry/rdap/RdapJsonFormatterTest.java

@@ -295,6 +295,18 @@ public class RdapJsonFormatterTest {
         .isEqualTo(loadJson("rdapjson_techcontact.json"));
   }
 
+  @Test
+  public void testRolelessContact() throws Exception {
+    assertThat(
+            RdapJsonFormatter.makeRdapJsonForContact(
+                contactResourceTech,
+                false,
+                Optional.<DesignatedContact.Type>absent(),
+                LINK_BASE,
+                WHOIS_SERVER))
+        .isEqualTo(loadJson("rdapjson_rolelesscontact.json"));
+  }
+
   @Test
   public void testDomain_full() throws Exception {
     assertThat(

javatests/google/registry/rdap/testdata/rdapjson_rolelesscontact.json

@@ -0,0 +1,45 @@
+{
+  "objectClassName" : "entity",
+  "handle" : "6-ROID",
+  "status" : ["active"],
+  "links" :
+  [
+    {
+      "value" : "http://myserver.google.com/entity/6-ROID",
+      "rel" : "self",
+      "href" : "http://myserver.google.com/entity/6-ROID",
+      "type" : "application/rdap+json"
+    }
+  ],
+  "events": [
+    {
+      "eventAction": "registration",
+      "eventActor": "foo",
+      "eventDate": "1997-01-01T00:00:00.000Z"
+    },
+  ],
+  "vcardArray" :
+  [
+    "vcard",
+    [
+      ["version", {}, "text", "4.0"],
+      ["fn", {}, "text", "The Raven"],
+      ["org", {}, "text", "GOOGLE INCORPORATED <script>"],
+      ["adr", {}, "text", [
+        "",
+        "",
+        [
+          "Chamber Door",
+          "upper level"
+        ],
+        "KOKOMO",
+        "BM",
+        "31337",
+        "United States"]],
+      ["tel", {"type" : ["voice"]}, "uri", "tel:+1.2126660420"],
+      ["tel", {"type" : ["fax"]}, "uri", "tel:+1.2126660420"],
+      ["email", {}, "text", "bog@cat.みんな"]
+    ]
+  ],
+  "port43": "whois.google.com"
+}