Move the file location of launchable.rb

bootstraptest/runner.rb

@@ -236,7 +236,7 @@ End
         return true
       end
 
-      require_relative '../tool/lib/test/unit/launchable'
+      require_relative '../tool/lib/launchable'
       BT.launchable_test_reports = writer = Launchable::JsonStreamWriter.new($1)
       writer.write_array('testCases')
       at_exit {

tool/lib/test/unit.rb

@@ -1450,7 +1450,7 @@ module Test
       def setup_options(opts, options)
         super
         opts.on_tail '--launchable-test-reports=PATH', String, 'Report test results in Launchable JSON format' do |path|
-          require_relative '../test/unit/launchable'
+          require_relative '../launchable'
           options[:launchable_test_reports] = writer = Launchable::JsonStreamWriter.new(path)
           writer.write_array('testCases')
           main_pid = Process.pid

tool/test/testunit/test_launchable.rb

@@ -2,7 +2,7 @@
 require 'test/unit'
 require 'tempfile'
 require 'json'
-require_relative '../../lib/test/unit/launchable'
+require_relative '../../lib/launchable'
 
 class TestLaunchable < Test::Unit::TestCase
   def test_json_stream_writer