py3: Remove six type aliases usage

Merged Dmitry Volodin requested to merge noc-no-six-types into master

Удалены alias'ы типов six по схеме:

  • six.string_types -> str
  • six.text_type -> str
  • six.binary_type -> bytes
  • six.integer_types -> int
Edited by Dmitry Volodin

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