Pysmb

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- Fix bug in listShares() method which fails when the remote server has many shares.
- Improve echo() method to test and fail if the provided data to echo is not a bytes object.
- Fix bug in listPath() method where the path to query is not properly terminated.

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- Fix bug in getAttributes() method which should return only the filename
instead of the entire path for the filename property for the return result.

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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