Pysmb

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- Remove support for SMB-2.1 dialect as it seems to have issues with Windows 2008 R2

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- Prevents OperationError from being raised when listPath() operation does not
return any matching file results.
- SMBConnection is now a context manager 122.

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- Fix buggy support for search parameter in listPath() method. Add
SMB_FILE_ATTRIBUTE_INCL_NORMAL bit constant to include 'normal' files with
other file types in the returned result. From now on, pysmb defines a 'normal' file
as a file entry that is not read-only, not hidden, not system, not archive and
not a directory; it ignores other attributes like compression, indexed, sparse,
temporary and encryption. listPath() method will now include 'normal' files
using the default search parameter.
- Add isNormal property to SharedFile class to support test if the file is a
'normal' file (according to pysmb definition of 'normal' file).

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- Improve listPath implementation for SMB1
- Support for STATUS_PENDING responses across all SMB2 operations.

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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.