spec cleanup: summary should not end with a dot
spec cleanup: summary should not end with a dot

References:
https://fedoraproject.org/wiki/Common_Rpmlint_issues#summary-ended-with-dot
https://en.opensuse.org/openSUSE:Specfile_guidelines#Summary

+ it's an internal inconsistency with Summary for -devel package

kgaillot/libqb,kgaillot/libqb,ClusterLabs/libqb,ClusterLabs/libqb,ClusterLabs/libqb,kgaillot/libqb