Copying salt minion config to /etc/salt
Failed to upload a file to the guest VM via SCP due to a permissions
error. This is normally because the SSH user doesn't have permission
to write to the destination location. Alternately, the user running
Vagrant on the host machine may not have permission to read the file.
I have that problem also in 1.7.4 but not in 1.7.2 with the same Vagrantfile.