[~TASK] FLOW3 (Log): Use binary mode when opening log file.
[~TASK] FLOW3 (Log): Use binary mode when opening log file.

Instead of using the text mode we use binary mode, as also recommended
by the PHP developers. Since we use PHP_EOL in the FileBackend anyway,
this does not affect the output.

This fixes a problem in the unit test, since vfs does not support the
text mode.

Change-Id: I42a07dacf46104abe0e74a48b1560f869e939406
Original-Commit-Hash: f25789c96165510ae4c8613ebff954e7591a2129

robertlemke/flow-development-collection,aertmann/flow-development-collection,neos/flow-development-collection,aertmann/flow-development-collection,mkeitsch/flow-development-collection,daniellienert/flow-development-collection,kitsunet/flow-development-collection,gerhard-boden/flow-development-collection,dfeyer/flow-development-collection,dlubitz/flow-development-collection,gerhard-boden/flow-development-collection,albe/flow-development-collection,fcool/flow-development-collection,bwaidelich/flow-development-collection,chewbakartik/flow-development-collection,kdambekalns/flow-development-collection,chewbakartik/flow-development-collection,bwaidelich/flow-development-collection,mkeitsch/flow-development-collection,robertlemke/flow-development-collection,gerhard-boden/flow-development-collection,dlubitz/flow-development-collection,robertlemke/flow-development-collection,chewbakartik/flow-development-collection,dfeyer/flow-development-collection,fcool/flow-development-collection,dfeyer/flow-development-collection,kdambekalns/flow-development-collection,neos/flow-development-collection,kdambekalns/flow-development-collection,daniellienert/flow-development-collection,fcool/flow-development-collection,aertmann/flow-development-collection,dlubitz/flow-development-collection,bwaidelich/flow-development-collection,kitsunet/flow-development-collection,albe/flow-development-collection,kdambekalns/flow-development-collection,mkeitsch/flow-development-collection,neos/flow-development-collection,daniellienert/flow-development-collection,dfeyer/flow-development-collection,robertlemke/flow-development-collection,kitsunet/flow-development-collection,albe/flow-development-collection,fcool/flow-development-collection,neos/flow-development-collection