(trivial) os: read file descriptors into client struct at once
Instead of having the request handler ask for fd's one by one, just read them all into a little array in ClientRec struct. And also automatically clean up after request had been handled.
Request handlers need to set the entries to -1 if they shouldn't be closed automatically.
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net