java-1.7.0-openjdk security update

1:1.7.0.251-2.6.21.0.0.1 - Update DISTRONAME in specfile 1:1.7.0.251-2.6.21.0 - Bump to 2.6.21 and OpenJDK 7u251-b02. - Resolves: rhbz1785753...