Test for mysql and mysql-server by dependency not by name
Test for mysql and mysql-server by dependency not by name

mysql is provided by mariadb in el7; osg-test checks for the mysql
package's presence by name (so only the package named 'mysql' passes,
not packages that provide 'mysql').

git-svn-id: 884a03e47e2adb735d896e55bb5ad6bc3421ba19@21492 4e558342-562e-0410-864c-e07659590f8c

efajardo/osg-test,efajardo/osg-test