Remove 'fullyQualified' from host and domain names (#631)

* Remove 'fullyQualified' from host and domain names

We don't actually enforce that these are properly fully-qualified
(there's no dot at the end) and we specifically use the term "label
name" when talking about labels.

Note: this doesn't convert FQDN -> DN (et al) in at least two types of
cases:
1. When the term is part of the XML schema
2. When the term is used by some external system, e.g. SafeBrowsing API

* Add TODO to rename fields

core/src/main/javascript/google/registry/ui/externs/json.js

@@ -34,7 +34,7 @@ registry.json.locks = {};
 
 /**
  * @typedef {{
- *   fullyQualifiedDomainName: string,
+ *   domainName: string,
  *   lockedTime: string,
  *   lockedBy: string,
  *   userCanUnlock: boolean,

core/src/main/javascript/google/registry/ui/js/registrar/registry_lock.js

@@ -173,7 +173,7 @@ registry.registrar.RegistryLock.prototype.lockOrUnlockDomain_ = function(isLock,
       'POST',
       goog.json.serialize({
         'clientId': this.clientId,
-        'fullyQualifiedDomainName': domain,
+        'domainName': domain,
         'isLock': isLock,
         'password': password,
         'relockDurationMillis': relockDuration