[BUGFIX] Silence warning on writing PackageStates.php
When the file permissions on for example the configuration folder are
not correct a PHP warning is shown. This is shown on top of the
friendly error TYPO3.Setup message and should be hidden.
The only way to silence this is to use the shut-up operator in
sortAndSavePackageStates() inside PackageManager. Any exception or
error code thrown at that point are not catchable by a (setup)
Releases: master, 2.0