[New: openFATE 310693] Include version information in XML stream

Feature added by: Lars Vogdt (lrupp) Feature #310693, revision 1 Title: Include version information in XML stream Buildservice: New Priority Requester: Desirable Requested by: Lars Vogdt (lrupp) Description: To avoid people using outdated OBS clients (like osc), it might be a good idea to include a "obs-version" number in the results of a request, so the clients can print out some warnings if the obs-version is too new for them (or even incompatible). -- openSUSE Feature: https://features.opensuse.org/310693