Move thrown.expect() right before the throwing statement

aka regexing for fun and profit.

This also makes sure that there are no statements after the
throwing statement, since these would be dead code. There
were a surprising number of places with assertions after
the throw, and none of these are actually triggered in tests
ever. When I found these, I replaced them with try/catch/rethrow
which makes the assertions actually happen:

before:

// This is the ExceptionRule that checks EppException marshaling
thrown.expect(FooException.class);
doThrowingThing();
assertSomething();  // Dead code!

after:

try {
  doThrowingThing();
  assertWithMessage("...").fail();
} catch (FooException e) {
  assertSomething();
  // For EppExceptions:
  assertAboutEppExceptins().that(e).marshalsToXml();
}

To make this work, I added EppExceptionSubject.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=135793407

javatests/google/registry/testing/EppExceptionSubject.java

@@ -1,4 +1,4 @@
-// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+// Copyright 2016 The Nomulus Authors. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.