Copy all of `/mnt/uploads` to the slaves
Copy all of `/mnt/uploads` to the slaves

The asset slaves should be a complete copy of the asset master.
At the moment some asset slaves contain more data than the master
on `/mnt/uploads` and some contain less. We can work around this
for the time being by syncing the entire directory.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet