+++ This bug was initially created as a clone of Bug #1198693 +++
Description of problem:
Based on discussion at:
https://www.redhat.com/archives/sclorg/2015-February/msg00032.html
Let's get rid of hardcoded 'scls' part in %{_sysconfdir} and %{_localstatedir} macros definitions in scl-utils-build, if the same dir is not used under /opt/<vendor> as well. It is inconsistent right now.
It may have sense to have another level of directories under /opt/<vendor>, but it doesn't make sense to require this for all collections.
If some distro wants to use the 'scls' dir, it just needs to re-define %_scl_prefix macro.