[Pkg-freevo-maint] Bug#575293: Bug#575293: python-kaa-base: integration with twisted does not work anymore

[Alexandre Rossi]

> It happens like that :
>   1. import kaa
>   2. in kaa/__init__.py line 39 "from async import ..."
>   3. in kaa/async.py line 977 "import main"
>   4. in kaa/main.py line 30 "from process import supervisor"
>   5. in kaa/process.py line 182 "supervisor = _Supervisor"
>   6. in kaa/process.py line 64 in constructor of _Supervisor :
> "signal.signal(signal.SIGCHLD, self._sigchld_handler)"