minor #678 update PHPUnit configuration (add XSD, remove defaults, proper formatting) (craue)

This PR was merged into the 2.3 branch.

Discussion
----------

update PHPUnit configuration (add XSD, remove defaults, proper formatting)

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | --
| License       | MIT
| Doc PR        | --

See symfony/symfony#11344.

Commits
-------

324692e updated PHPUnit configuration (added XSD, removed defaults, proper formatting)

Author: fabpot

app/phpunit.xml.dist

@@ -1,18 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- http://phpunit.de/manual/current/en/appendixes.configuration.html -->
-<phpunit
-    backupGlobals               = "false"
-    backupStaticAttributes      = "false"
-    colors                      = "true"
-    convertErrorsToExceptions   = "true"
-    convertNoticesToExceptions  = "true"
-    convertWarningsToExceptions = "true"
-    processIsolation            = "false"
-    stopOnFailure               = "false"
-    syntaxCheck                 = "false"
-    bootstrap                   = "bootstrap.php.cache" >
-
+<!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.1/phpunit.xsd"
+         backupGlobals="false"
+         colors="true"
+         bootstrap="bootstrap.php.cache"
+>
     <testsuites>
         <testsuite name="Project Test Suite">
             <directory>../src/*/*Bundle/Tests</directory>
@@ -37,5 +31,4 @@
             </exclude>
         </whitelist>
     </filter>
-
 </phpunit>