Auto clean missing registered files on SSH data providers

[natacha-beck]

Related: 1756 || #37

By Pierre:

Currently I identify them using the console:

dps= SshDataProvider.where(:online => true).all
no_log; ba=[]; dps.each do |dp|
    c=dp.userfiles.count
    puts "\n\n\n######## #{dp.name} #{c} #########" 
    dp.userfiles.each_with_index do |u,i|
        r=dp.provider_file_exists?(u) || :error
        puts "#{i+1}/#{c}\t#{r}\t#{u.name}" 
        break if r == :error
        ba.push(u.id) if r == :absent
    end
end
puts "Array ba[] contains bad userfile IDs." 

[remibernard]

This can now be done semi-automatically using the DP consistency checks (0fb36a5).