minor #13033 [Tests] Silenced all deprecations in tests for 2.3 (saro0h)

This PR was merged into the 2.3 branch.

Discussion
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[Tests] Silenced all deprecations in tests for 2.3

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

Also removed src/Symfony/Component/Security/Core/Tests/Validator/Constraints/UserPasswordValidatorTest.php as it was not running at all.

Commits
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ef4ae63 [Tests] Silenced all deprecations in tests for 2.3

Author: fabpot

phpunit.xml.dist

@@ -6,7 +6,10 @@
          colors="true"
          bootstrap="vendor/autoload.php"
 >
-
+    <php>
+        <!-- Silence E_USER_DEPRECATED (-16385 == -1 & ~E_USER_DEPRECATED) -->
+        <ini name="error_reporting" value="-16385"/>
+    </php>
     <testsuites>
         <testsuite name="Symfony TwigBundle Test Suite">
             <directory>./Tests/</directory>