pep8: more whitespaces fixes

count   err# description

1       E222 multiple spaces after operator
1       E225 missing whitespace around operator
1       W291 trailing whitespace
2       E262 inline comment should start with '# '
3       E302 expected 2 blank lines, found 1
3       E303 too many blank lines (2)
3       W293 blank line contains whitespace
31      E261 at least two spaces before inline comment

Change-Id: I64bdd669ca0a8e41065b81a65167a62b65ee6eb6
Merge "pep8: more whitespaces fixes"