Add 'table' argument to more functions to make it work.
Rename 'ip' argument to 'family', to be consistent with ip tools doc.
Switch default of 'loc' argument to be more meaningful.
Replace "temp" constant with existing cf.tempdir.
Move 'table' keyword of get_stdout_bird from callee to caller.
Remove 'pref' from ip-route output, as it is reported by some versions of ip tools.