ignore exeuction of run_prefix on remote machine

[arabnejad]

in the current version, for each submitted job on the remote machine,
these statements

with cd(job_results_dir[threading.get_ident()]['job_results']):
        with prefix(env.run_prefix):
                run(...)

are not needed to be executed on the remote machine, for example, if run_prefix contains loading modules, you will get error output like

'module load' works only on Wn(worker nodes)!
To use module load please create job/interactive job.

however, in the case of localhost executing, those are mandatory
I think adding a simple check to ignore the execution of these commands would be helpful to decrease the output log