message: Add metavar to match var name in help text + Change wording for better readability
diff: @@ -214,7 +214,7 @@ def main():
  epilog='''
  Help text and arguments for individual test script:''',
  formatter_class=argparse.RawTextHelpFormatter)
  - parser.add_argument('--combinedlogslen', '-c', type=int, default=0, help='print a combined log (of length n lines) from all test nodes and test framework to the console on failure.')
  + parser.add_argument('--combinedlogslen', '-c', type=int, default=0, metavar='n', help='On failure, print a log (of length n lines) to the console, combined from the test framework and all test nodes.')
  parser.add_argument('--coverage', action='store_true', help='generate a basic coverage report for the RPC interface')
  parser.add_argument('--exclude', '-x', help='specify a comma-separated-list of scripts to exclude.')
  parser.add_argument('--extended', action='store_true', help='run the extended test suite in addition to the basic tests')
  