Use same versionlock.list file for xrootd4 and 5
Currently we have two different files to compile CTA with xrootd4 and 5, to avoid this kind of work duplication (!201 (comment 5591181)), better to use one single file and follow the way to switch between xrootd4-5, like it's done for eos4-5 in versionlock_tools.sh
Do the same with cta-ci-xrootd5-enabled.repo