end2end drivers: cleanup/propose new solution for first part of the driver

[fnrizzi]

can we do this better?
The only constraint we have is that a driver file HAS be run from within the build directory.

  # set working directory to where we call this file from
  workDirFullPath = os.path.realpath(".")
  print("workingDir =", workDirFullPath)

  # ensure this is NEVER called directly from the tutorials repo
  # because we want to this to be called from within the build
  # directory of the tutorials or any other place
  # except the tutorials source.
  if is_git_repo(workDirFullPath):
    print("you cannot run this script from the tutorials repo!")
    sys.exit(23)

  # find full path to the top-level tutorials repo
  ptutRepoFullPath = str(os.path.split(os.path.dirname(__file__))[0])
  print("PTUT repo  =", ptutRepoFullPath)
  ptutRepoEndToEndFullPath = ptutRepoFullPath + '/end-to-end-roms'

  # read the full workflow dic
  wfDic = read_workflow_yaml_file(workDirFullPath+'/'+wfFile)
  assert_valid_and_supported_problem(wfDic, ptutRepoEndToEndFullPath)
  problemName = find_problem_name_from_wf_dic(wfDic)

  # import customizations from target problem
  # we can do this safely because we already asserted customization exists
  moduleName = 'customizations_'+problemName
  sys.path.append(os.path.realpath(ptutRepoEndToEndFullPath+'/'+moduleName))
  print("Loading customizations from {}".format(moduleName))
  customModule = importlib.import_module(moduleName)