adapt Rakefile to submit to correct build service project in maintenance branch SLE-12-GA
Revert accidental revert of "Revert "deprecate maintainer file""

This reverts commit 7af45e67499f710c59bd9eaada69a0ca4bd7e2fb.
Revert "adapt Rakefile to submit to correct build service project in maintenance branch SLE-12-GA"

This reverts commit 9c271821edbfac427e9308a604f865cce7cd1400.