extract _job_group
refactor to use Genome::Sys::LSF::bsub
support passing in the bsub executable

We need to be able to pass in `sudo bsub` so we can't hard-code the
executable as `bsub`.
_capture already lazy loads IPC::System::Simple
remove space between option and value

We need to keep the option, e.g. `-g`, connected to the value, e.g.
`/apipe-builder`, so that the wrapper that we use to sudo can allow us
to securely run commands like:

    sudo -i bsub [options] annotate-log \
        genome model services build run [options]
support launching builds as the run_as user
add support for launching builds as the run_as user