Use a proper exception class hierarchy for SFTPClient

[Nicolas Noirbent]

paramiko raises IOError / EOFError when operations fail on the remote server, i.e. when using SFTPClient.chdir() on a non-existing folder. Wouldn't it be better to create SFTPIOError and SFTPEOFError and have them inherit from both SFTPError and respectively IOError / EOFError ? This way one could catch all exceptions from SFTP, or catch indiscriminately on IOError / EOFError.

In the same way, wouldn't it be logical for SFTPError to inherit from SSHException ?

Both of these changes seem pretty painless to me, and wouldn't break existing applications using paramiko. I can write a patch for this myself if you'd consider inlcuding it in trunk.

Cheers

[Robey Pointer (robey)]

sounds fine to me.