Fix EZP-22131: handle exceptions in legacy kernel callback
Fixed 'PHP Warning:  strpos(): Empty delimiter' warning in unit test
Fixed typo
Fixed 'PHP Notice:  Undefined index: REQUEST_METHOD' notice in unit test
EZP-21775: Implement eZClusterFileHandlerInterface
Merge pull request #790 from jeromegamez/ezfsfilehandler_ezclusterfilhandlerinterface

EZP-21775: Make eZFSFileHandler implement eZClusterFileHandlerInterface
Merge pull request #855 from ezsystems/fix/EZP-22131-legacy_callback_exceptions

Fix EZP-22131: handle exceptions in legacy kernel callback
Merge pull request #869 from dymissy/master

Fixed some warnings printed out during unit test