Clarify AppBadFormatting error

[annawoodard]

As reported by @madduri.

The error message raised on badly formatted bash apps is not clear. This is slightly better for threads than IPP, but both are not as helpful as they should be. We need to make sure the error message the user sees is actually formatted with the info we want to provide. Also, we should add more info: all of the args, kwargs, template, etc.

With IPP:

Traceback (most recent call last):
  File "/Users/awoodard/ci/parsl/parsl/dataflow/dflow.py", line 187, in handle_update
    res = future.result()
  File "/Users/awoodard/software/anaconda3/envs/parsl_py36/lib/python3.6/concurrent/futures/_base.py", line 398, in result
    return self.__get_result()
  File "/Users/awoodard/software/anaconda3/envs/parsl_py36/lib/python3.6/concurrent/futures/_base.py", line 357, in __get_result
    raise self._exception
  File "/Users/awoodard/software/anaconda3/envs/parsl_py36/lib/python3.6/site-packages/ipyparallel/client/asyncresult.py", line 224, in _resolve_result
    raise r
ipyparallel.error.RemoteError: AppBadFormatting()

With threads:

Traceback (most recent call last):
  File "/Users/awoodard/ci/parsl/parsl/app/bash.py", line 34, in remote_side_bash_executor
    executable = partial_cmdline.format(*args, **kwargs)
IndexError: tuple index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test_bash_apps/test_error_codes.py", line 184, in <module>
    test_bash_formatting()
  File "test_bash_apps/test_error_codes.py", line 76, in test_bash_formatting
    f.result()
  File "/Users/awoodard/ci/parsl/parsl/dataflow/futures.py", line 117, in result
    res = self.parent.result(timeout=timeout)
  File "/Users/awoodard/software/anaconda3/envs/parsl_py36/lib/python3.6/concurrent/futures/_base.py", line 405, in result
    return self.__get_result()
  File "/Users/awoodard/software/anaconda3/envs/parsl_py36/lib/python3.6/concurrent/futures/_base.py", line 357, in __get_result
    raise self._exception
  File "/Users/awoodard/ci/parsl/parsl/dataflow/dflow.py", line 187, in handle_update
    res = future.result()
  File "/Users/awoodard/software/anaconda3/envs/parsl_py36/lib/python3.6/concurrent/futures/_base.py", line 398, in result
    return self.__get_result()
  File "/Users/awoodard/software/anaconda3/envs/parsl_py36/lib/python3.6/concurrent/futures/_base.py", line 357, in __get_result
    raise self._exception
  File "/Users/awoodard/software/anaconda3/envs/parsl_py36/lib/python3.6/concurrent/futures/thread.py", line 55, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Users/awoodard/ci/parsl/parsl/app/bash.py", line 43, in remote_side_bash_executor
    raise pe.AppBadFormatting("[{}] App formatting failed during cmd_line resolution: {}".format(func_name, e), None)
parsl.app.errors.AppBadFormatting