rpllint: add proper command line interface
It should not blow up:
$ ./rplint.py
Traceback (most recent call last):
File "./rplint.py", line 262, in <module>
tests_path = sys.argv[1]
IndexError: list index out of range
It should not blow up:
$ ./rplint.py
Traceback (most recent call last):
File "./rplint.py", line 262, in <module>
tests_path = sys.argv[1]
IndexError: list index out of range