regress:regression: move regressionFilter() to futcom module

1) Rename regressionFilter() to filtering() and move it to futcom
   module since it is a common method used elsewhere.
2) Import the methods from futcom module and directly use them in
   the following context.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
misc: move futcom to misc subsystem

1) Move futcom to misc subsystem to sustain it easily.
2) Update all affected modules correspondingly.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>