pydarshan: make lint failed

[wkliao]

There are 4 make commands for testing pydarshan. make lint is the last one.
It failed with many error messages. Below shows only a few of them.

darshan/__init__.py:13:13: E261 at least two spaces before inline comment
darshan/__init__.py:16:1: E265 block comment should start with '# '
darshan/__init__.py:17:1: E402 module level import not at top of file
darshan/__init__.py:21:1: E303 too many blank lines (3)
darshan/__init__.py:32:19: W291 trailing whitespace
darshan/__init__.py:39:1: W293 blank line contains whitespace
darshan/__init__.py:43:80: E501 line too long (82 > 79 characters)
darshan/__init__.py:45:1: W293 blank line contains whitespace
darshan/backend/api_def_c.py:5:74: W291 trailing whitespace
darshan/backend/api_def_c.py:16:80: E501 line too long (80 > 79 characters)
darshan/backend/api_def_c.py:17:80: E501 line too long (81 > 79 characters)
...