Smoother transition to opsi 4.1

Work towards a public opsi 4.1 release is making progress. Today's release has brought us a small step closer to a seamless migration from 4.0 to 4.1.

The release includes an opsi-atftpd which provides opsi-tftpd and the updated opsipxeconfd, opsi-depotserver and opsi4ucs all require this. This makes it easier to switch to a different tftpd without requiring any further user interaction.

opsi 4.1 will be released in a separate repository. Our current migration path is adding the new repository and then run apt, yum or zypper with their upgrade options to migrate to the new version. To finish the migration you will have to run opsi-setup with the update parameter for the backends you use and this is it.