Updated to latest RC release: nfs-utils-2-3-4-rc2
    
    Addeding libxml2-devel dependency
    Make sure /etc/sysconfig/nfs is immutable
    Added Requires: e2fsprogs (bz 1647727)
    nfsref: switch the way libraries are linked
    
    Signed-off-by: Steve Dickson <steved@redhat.com>