crash on cleanup, local archive files not found remote (lp:#545823)

[Original report](https://bugs.launchpad.net/bugs/545823) created by **Jelle de Jong (jelledejong)**
```
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http://lists.gnu.org/archive/html/duplicity-talk/2010-03/msg00099.html

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host02:~# duplicity --version
duplicity 0.6.08b

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host02:~# duplicity cleanup --extra-clean --force
scp://host02-backup@host01.example.com/backup/vmail
GnuPG passphrase:
Local and Remote metadata are synchronized, no sync needed.
Warning, found the following remote orphaned signature files:
duplicity-new-signatures.20100203T223035Z.to.20100204T223041Z.sigtar.gpg
duplicity-new-signatures.20100204T223041Z.to.20100205T223035Z.sigtar.gpg
duplicity-new-signatures.20100205T223035Z.to.20100206T223034Z.sigtar.gpg
duplicity-new-signatures.20100206T223034Z.to.20100207T223036Z.sigtar.gpg
duplicity-new-signatures.20100207T223036Z.to.20100208T223035Z.sigtar.gpg
duplicity-new-signatures.20100208T223035Z.to.20100209T223042Z.sigtar.gpg
duplicity-new-signatures.20100209T223042Z.to.20100210T223033Z.sigtar.gpg
duplicity-new-signatures.20100210T223033Z.to.20100211T223040Z.sigtar.gpg
duplicity-new-signatures.20100211T223040Z.to.20100212T223033Z.sigtar.gpg
duplicity-new-signatures.20100212T223033Z.to.20100213T223037Z.sigtar.gpg
duplicity-new-signatures.20100213T223037Z.to.20100214T223033Z.sigtar.gpg
duplicity-new-signatures.20100214T223033Z.to.20100215T223037Z.sigtar.gpg
duplicity-new-signatures.20100215T223037Z.to.20100216T223037Z.sigtar.gpg
duplicity-new-signatures.20100216T223037Z.to.20100217T223037Z.sigtar.gpg
duplicity-new-signatures.20100217T223037Z.to.20100218T223039Z.sigtar.gpg
duplicity-new-signatures.20100218T223039Z.to.20100219T230500Z.sigtar.gpg
duplicity-new-signatures.20100219T230500Z.to.20100311T171314Z.sigtar.gpg
duplicity-new-signatures.20100311T171314Z.to.20100311T172255Z.sigtar.gpg
Warning, found the following orphaned backup file:
[duplicity-inc.20100311T173524Z.to.20100311T223101Z.manifest.part]
Last full backup date: Fri Mar 12 23:30:52 2010
Deleting these files from backend:
duplicity-full-signatures.20100202T094033Z.sigtar.gz
duplicity-new-signatures.20100202T094033Z.to.20100203T223035Z.sigtar.part
duplicity-new-signatures.20100203T223035Z.to.20100204T223041Z.sigtar.gz
duplicity-new-signatures.20100204T223041Z.to.20100205T223035Z.sigtar.gz
duplicity-new-signatures.20100205T223035Z.to.20100206T223034Z.sigtar.gz
duplicity-new-signatures.20100206T223034Z.to.20100207T223036Z.sigtar.gz
duplicity-new-signatures.20100207T223036Z.to.20100208T223035Z.sigtar.gz
duplicity-new-signatures.20100208T223035Z.to.20100209T223042Z.sigtar.gz
duplicity-new-signatures.20100209T223042Z.to.20100210T223033Z.sigtar.gz
duplicity-new-signatures.20100210T223033Z.to.20100211T223040Z.sigtar.gz
duplicity-new-signatures.20100211T223040Z.to.20100212T223033Z.sigtar.gz
duplicity-new-signatures.20100212T223033Z.to.20100213T223037Z.sigtar.gz
duplicity-new-signatures.20100213T223037Z.to.20100214T223033Z.sigtar.gz
duplicity-new-signatures.20100214T223033Z.to.20100215T223037Z.sigtar.gz
duplicity-new-signatures.20100215T223037Z.to.20100216T223037Z.sigtar.gz
duplicity-new-signatures.20100216T223037Z.to.20100217T223037Z.sigtar.gz
duplicity-new-signatures.20100217T223037Z.to.20100218T223039Z.sigtar.gz
duplicity-new-signatures.20100218T223039Z.to.20100219T230500Z.sigtar.gz
duplicity-new-signatures.20100219T230500Z.to.20100311T171314Z.sigtar.gz
duplicity-new-signatures.20100311T171314Z.to.20100311T172255Z.sigtar.gz
duplicity-new-signatures.20100311T172255Z.to.20100311T173524Z.sigtar.part
duplicity-new-signatures.20100311T173524Z.to.20100311T223101Z.sigtar.part
duplicity-inc.20100311T173524Z.to.20100311T223101Z.manifest.part
duplicity-full-signatures.20100202T094033Z.sigtar.gpg
duplicity-new-signatures.20100203T223035Z.to.20100204T223041Z.sigtar.gpg
duplicity-new-signatures.20100204T223041Z.to.20100205T223035Z.sigtar.gpg
duplicity-new-signatures.20100205T223035Z.to.20100206T223034Z.sigtar.gpg
duplicity-new-signatures.20100206T223034Z.to.20100207T223036Z.sigtar.gpg
duplicity-new-signatures.20100207T223036Z.to.20100208T223035Z.sigtar.gpg
duplicity-new-signatures.20100208T223035Z.to.20100209T223042Z.sigtar.gpg
duplicity-new-signatures.20100209T223042Z.to.20100210T223033Z.sigtar.gpg
duplicity-new-signatures.20100210T223033Z.to.20100211T223040Z.sigtar.gpg
duplicity-new-signatures.20100211T223040Z.to.20100212T223033Z.sigtar.gpg
duplicity-new-signatures.20100212T223033Z.to.20100213T223037Z.sigtar.gpg
duplicity-new-signatures.20100213T223037Z.to.20100214T223033Z.sigtar.gpg
duplicity-new-signatures.20100214T223033Z.to.20100215T223037Z.sigtar.gpg
duplicity-new-signatures.20100215T223037Z.to.20100216T223037Z.sigtar.gpg
duplicity-new-signatures.20100216T223037Z.to.20100217T223037Z.sigtar.gpg
duplicity-new-signatures.20100217T223037Z.to.20100218T223039Z.sigtar.gpg
duplicity-new-signatures.20100218T223039Z.to.20100219T230500Z.sigtar.gpg
duplicity-new-signatures.20100219T230500Z.to.20100311T171314Z.sigtar.gpg
duplicity-new-signatures.20100311T171314Z.to.20100311T172255Z.sigtar.gpg
Remote file or directory does not exist in command='rm "duplicity-
inc.20100311T173524Z.to.20100311T223101Z.manifest.part"'
Running 'sftp  -oServerAliveInterval=15 -oServerAliveCountMax=1
host02-backup@host01.example.com' failed (attempt #1)
Remote file or directory does not exist in command='rm "duplicity-
inc.20100311T173524Z.to.20100311T223101Z.manifest.part"'
Running 'sftp  -oServerAliveInterval=15 -oServerAliveCountMax=1
host02-backup@host01.example.com' failed (attempt #2)
Remote file or directory does not exist in command='rm "duplicity-
inc.20100311T173524Z.to.20100311T223101Z.manifest.part"'
Running 'sftp  -oServerAliveInterval=15 -oServerAliveCountMax=1
host02-backup@host01.example.com' failed (attempt #3)
Remote file or directory does not exist in command='rm "duplicity-
inc.20100311T173524Z.to.20100311T223101Z.manifest.part"'
Running 'sftp  -oServerAliveInterval=15 -oServerAliveCountMax=1
host02-backup@host01.example.com' failed (attempt #4)
Remote file or directory does not exist in command='rm "duplicity-
inc.20100311T173524Z.to.20100311T223101Z.manifest.part"'
Running 'sftp  -oServerAliveInterval=15 -oServerAliveCountMax=1
host02-backup@host01.example.com' failed (attempt #5)
Giving up trying to execute 'sftp  -oServerAliveInterval=15
-oServerAliveCountMax=1 host02-backup@host01.example.com' after 5 attempts
BackendException: Error running 'sftp  -oServerAliveInterval=15
-oServerAliveCountMax=1 host02-backup@host01.example.com'

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See file attached to this bug report.

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```

Story points: 12.0