pithos: Fix reconcile commands

Pithos+ reconcile commands used to extend the
'django.core.management.base.NoArgsCommand'.
Hence, the logic was implemented in the handle_noargs().

A previous commit has changed these commands and since then they extend
the 'snf_django.management.commands.SynnefoCommand'.

However, SynnefoCommand expects that the logic is implemented in handle()
method.

This commit fixes this issue.