Add daemonize bundle

Ref: https://dev.cfengine.com/issues/6307

See this conversation on help-cfengine:

https://groups.google.com/forum/#!topic/help-cfengine/P1yHW7OWirQ
I didn't know that you could select the shell when using `inshell`. This works for me on Linux and SmartOS (so anything class `sunos` should work). The trick here really is that for cfengine to fully detach the child process needs to close `STDOUT` and `STDERR`, which is a common practice for daemonizing processes.

I agree about the quoting, but I have no better solution than anybody else. Quoting in nested subshells is not easy.