Update ruby193-rubygem-foreman_bootdisk to 1.2.2-2.el6

- Add isohybrid and mkisofs dependencies (dcleal@redhat.com)
Update rubygem-foreman_bootdisk to 1.2.2-2.fc18

- Add isohybrid and mkisofs dependencies (dcleal@redhat.com)
Update rubygem-foreman_bootdisk to 1.2.2-2.fc19

- Add isohybrid and mkisofs dependencies (dcleal@redhat.com)