[#3287] fix pylint warnings

[#3287] fix pylint warnings

- C0115: Missing class docstring (missing-class-docstring)
- C0123: Use isinstance() rather than type() for a typecheck. (unidiomatic-typecheck)
- C0201: Consider iterating the dictionary directly instead of calling .keys() (consider-iterating-dictionary)
- C0206: Consider iterating with .items() (consider-using-dict-items)
- C0411: standard import "..." should be placed before "..." (wrong-import-order)
- C0415: Import outside toplevel (...) (import-outside-toplevel)
- C1802: Do not use `len(SEQUENCE)` without comparison to determine if a sequence is empty (use-implicit-booleaness-not-len)
- E0001: Parsing failed: 'invalid syntax (<unknown>, line 2313)' (syntax-error)
- E0401: Unable to import '...' (import-error)
- E0602: Undefined variable 'l' (undefined-variable)
- R0205: Class 'VagrantEnv' inherits from object, can be safely removed from bases in python3 (useless-object-inheritance)
- E1101: Instance of 'NSECBASE' has no 'dump_fixedpart' member (no-member)
- E1123: Unexpected keyword argument 'capture' in method call (unexpected-keyword-arg)
- R0902: Too many instance attributes (too-many-instance-attributes)
- R0913: Too many arguments (too-many-arguments)
- R0916: Too many boolean expressions in if statement (6/5) (too-many-boolean-expressions)
- R1717: Consider using a dictionary comprehension (consider-using-dict-comprehension)
- R1722: Consider using 'sys.exit' instead (consider-using-sys-exit)
- R1732: Consider using 'with' for resource-allocating operations (consider-using-with)
- R1735: Consider using '{}' instead of a call to 'dict'. (use-dict-literal)
- W0102: Dangerous default value sys.argv[1:] (builtins.list) as argument (dangerous-default-value)
- W0102: Dangerous default value {} as argument (dangerous-default-value)
- W0106: Expression "[f.write('%02x' % x) for x in bin_address]" is assigned to nothing (expression-not-assigned)
- W0107: Unnecessary pass statement (unnecessary-pass)
- W0201: Attribute 'config' defined outside __init__ (attribute-defined-outside-init)
- W0404: Reimport '...' (imported line ...) (reimported)
- W0611: Unused import ... (unused-import)
- W0612: Unused variable '...' (unused-variable)
- W0613: Unused argument '...' (unused-argument)
- W0621: Redefining name '...' from outer scope (line 1471) (redefined-outer-name)
- W0622: Redefining built-in '...' (redefined-builtin)
- W0707: Consider explicitly re-raising using 'raise ... from ...' (raise-missing-from)
- W0718: Catching too general exception Exception (broad-exception-caught)
- W1202: Use lazy % formatting in logging functions (logging-format-interpolation)
- W1203: Use lazy % formatting in logging functions (logging-fstring-interpolation)
- W1308: Duplicate string formatting argument 'connection_type', consider passing as named argument (duplicate-string-formatting-argument)
- W1401: Anomalous backslash in string: '\/'. String constant might be missing an r prefix. (anomalous-backslash-in-string)
- W1406: The u prefix for strings is no longer necessary in Python >=3.0 (redundant-u-string-prefix)
- W1514: Using open without explicitly specifying an encoding (unspecified-encoding)
- W4901: Deprecated module 'optparse' (deprecated-module)
- W4904: Using deprecated class SafeConfigParser of module configparser (deprecated-class)