Pysmb

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- Fix bug where timestamp values for SMB1 getAttributes() response are not
converted properly from FILETIME to epoch time values.

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- Add getSecurity() method to support security descriptors query via SMB2
- Improve retrieveFile() and retrieveFileFromOffset() methods to allow file
retrievals over SMB2 even when the file is being locked on the server.
- Silently discards NMB SESSION_KEEPALIVE packets instead of raising warnings.
- SMB sessionID will be sent in ECHO requests to conform to SMB2 specs.
- Fix type errors for MD4 functions in python3.

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- Ignore STATUS_PENDING during delete and file store operations

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- Rollback fixes to NTLMv2 response algorithm in pysmb 1.1.17. The fixes
fail to work with some servers.
- Add missing errno imports in SMBConnection.py
- Fix UnboundLocalError raised when using type() in SMBConnection.py

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- Fix crashes in directory listing with keyerror 'support_dfs'
- Fix bugs in NTLMv2 response algorithm.
- Fix bugs where client domain is not included as part of the session negotiation.

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- Fix typo errors in authentication error messages
- Improve share listings on SMB2 protocol by ignoring interim STATUS_PENDING responses.