Fix the arguments --text, --data, --rodata, --bss and --metric in ben…

…chmark_size

This fix addresses issue #119 by making the implementation of the arguments
--text, --data, --rodata, --bss and --metric of benchmark_size.py match the
documenation.

Files changed:

        * benchmark_size.py: action='apend' is replaced by nargs='+' for
        --text, --data, --rodata, --bss and --metric.

benchmark_size.py

@@ -110,35 +110,35 @@ def build_parser():
  '--text',
  type=str,
  default=[],
- action='append',
+ nargs='+',
  help='Section name(s) containing code'
  )
  parser.add_argument(
  '--data',
  type=str,
  default=[],
- action='append',
+ nargs='+',
  help='Section name(s) containing non-zero initialized writable data'
  )
  parser.add_argument(
  '--rodata',
  type=str,
  default=[],
- action='append',
+ nargs='+',
  help='Section name(s) containing read only data'
  )
  parser.add_argument(
  '--bss',
  type=str,
  default=[],
- action='append',
+ nargs='+',
  help='Section name(s) containing zero initialized writable data'
  )
  parser.add_argument(
  '--metric',
  type=str,
  default=[],
- action='append',
+ nargs='+',
  choices=['text', 'rodata', 'data', 'bss'],
  help='Sections to include in metric: one or more of "text", "rodata", '
  + '"data" or "bss". Default "text"',