MAGETWO-38838: Create composer management library and reuse it in both updater and setup wizard

- fixed according to CR

Author: Ivan Gavryshko

dev/tests/unit/ConsoleArrayInputFactoryTest.php renamed to Tests/Composer/ConsoleArrayInputFactoryTest.php

@@ -78,7 +78,7 @@ function testWrongExitCode()
 
     function testRunCommand()
     {
-        $inputData = ['command'=>'update', '--working-dir' => '.'];
+        $inputData = ['command' => 'update', MagentoComposerApplication::COMPOSER_WORKING_DIR => '.'];
 
         $this->application->setConfig('path1', 'path2');
         $this->composerApplication->expects($this->once())->method('resetComposer');

dev/tests/unit/MagentoComposerApplicationTest.php renamed to Tests/Composer/MagentoComposerApplicationTest.php

@@ -17,7 +17,7 @@
   },
   "autoload": {
     "psr-4": {
-      "Magento\\": "app/code/Magento/"
+      "Magento\\Composer\\": "src"
     }
   }
 }