logging reform: Transport,SFTP* _log() refactor #74
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Transport._log() does not take msg list, it takes format string
SFTPClient/SFTPServer _log() method does not take msg list
SFTPBase gets new _loglist() method for the rare list case
Transport and SFTP* use proper logging format strings
and separate arguments
SSHClient and AuthHandler always log with single msg string,
so pass to Transport._log() as "%s", msg
get rid of util.tb_strings(), instead _log() with exc_info=True
so that lines of traceback are not separate log messages
(inspired by paramiko#406)