Fix pylint tips

Fix pylint tips

Change-Id: Ic0805cc13abc16afd1881c7513edf2f9f980d0fc
C: 58,0: Line too long (87/80)
W: 20,24: Redefining built-in 'id'
C:  1,0: Missing docstring
C: 11,4: Invalid name "version" for type constant (should match (([A-Z_][A-Z0-9_]*)|(__.*__))$)
C: 13,4: Invalid name "version" for type constant (should match (([A-Z_][A-Z0-9_]*)|(__.*__))$)
W: 26,8: No exception type(s) specified
C: 20,13: Invalid name "dist" for type constant (should match (([A-Z_][A-Z0-9_]*)|(__.*__))$)
C: 20,19: Invalid name "ver" for type constant (should match (([A-Z_][A-Z0-9_]*)|(__.*__))$)
C: 20,24: Invalid name "id" for type constant (should match (([A-Z_][A-Z0-9_]*)|(__.*__))$)
C: 43,0: Invalid name "prefix" for type constant (should match (([A-Z_][A-Z0-9_]*)|(__.*__))$)
C: 45,0: Invalid name "root" for type constant (should match (([A-Z_][A-Z0-9_]*)|(__.*__))$)
C: 47,0: Invalid name "conffile" for type constant (should match (([A-Z_][A-Z0-9_]*)|(__.*__))$)
C: 49,0: Invalid name "conf_str" for type constant (should match (([A-Z_][A-Z0-9_]*)|(__.*__))$)
C: 50,0: Invalid name "conf_str" for type constant (should match (([A-Z_][A-Z0-9_]*)|(__.*__))$)