[tq] Move to top-level package.

appengine/tq/tq_test.go

 // Copyright 2017 The LUCI Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 214 matching lines @@
                         rw = execute(`{"type":"google.protobuf.Duration","body":"blah"}`)
                         So(rw.Code, ShouldEqual, 202) // no retry!
                         So(rw.Body.String(), ShouldStartWith, "Bad payload, can't deserialize")
 
                         rw = execute(`{"type":"unknown.proto.type","body":"{}"}`)
                         So(rw.Code, ShouldEqual, 202) // no retry!
                         So(rw.Body.String(), ShouldStartWith, "Bad payload, can't deserialize")
                 })
         })
 }