Easiest thing?
Maybe not using CentOS 7.0?
Next bet, find out what software is ACTUALLY trying to be installed and return the proper information in the file?
In trunk/lib/redhat/config.sh you should find the package listing for the type of installation you’re attempting to perform. My guess, if my memory serves me well, is you’re attempting to to actually install MariaDB. I don’t know if the mysql-server package will actually do anything with the mariadb-server package as I’m not even sure if it installs with that name any more.