add e2fsprogs package

the fedora container was giving me a 

    > $ docker run --privileged -t -i dind_fedora
    [root@1b158166100f /]# 2014/10/10 08:42:26 docker daemon: 1.2.0 fa7b24f/1.2.0; execdriver: native; graphdriver: 
    [1bb2074b] +job serveapi(unix:///var/run/docker.sock)
    [info] Listening for HTTP on unix (/var/run/docker.sock)
    2014/10/10 08:42:26 exec: "mkfs.ext4": executable file not found in $PATH