Add option to chown unix-socket
Add option to chown the created unix-socket to a different user than the user the FastCGI application is running with.
Example: you want to run php as "webuser1" but need "www-data" to have access to the socket and don't want to use tcp sockets.
Added options to chown/chmod the socket and to create the socket before chroot() (fixes #1906)
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