build: merge branch 'build-cleanup-and-disable-ebpf'
- make contrib/rpm similar to master. - make .gitlab-ci.yml similar to master. - disable eBPF everywhere. Now it must be explicitly disabled. It seems to break unit tests on gitlab-ci, with something that looks like a kernel issue. Or maybe ulimit -l is so small? Anyway, disable it for now as there are problems with it.
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