wlgen/rta.py: rt-app log files are being pulled from the wrong directory

Created by: v0lker

specifying a JSON config with 'logdir' : '/some/path', i would expect the log files to be retrieved from /some/path. instead, the run_dir is used:

RTA::__postrun():

logfile = self.target.path.join(self.run_dir, '*{}*.log'.format(task))
self.target.pull(logfile, destdir)

this seems to suggest that the logdir parameter effectively only works if it is set to the run_dir.