Remove servicelogger from sandbox

[aaaaalbert]

I think that the actual sandbox runtime should not be concerned with redirecting its stdout into the servicelogger module's circular log. Redirection should be set up by the sandbox launcher script. (It's fine if the sandbox continues to throttles its log write rate itself, as it does with other resources.)

This isn't a big change for the Repy sandbox, but will allow us to generalize the way that the nodemanager launches other sandbox types, where some kind of output redirection will likely be desired too.