[FENCE] Enable new fence agents by default
    
    agents/Makefile:
     - enable lib target.
    
    agents/apc/fence_apc.py, bladecenter/fence_bladecenter.py,
    agents/drac/fence_drac5.py, agents/ilo/fence_ilo.py,
    agents/lib/fencing.py.py, agents/wti/fence_wti.py:
     - add version, build and copyright information.
     - fix path to fence agents lib.
    
    agents/bladecenter/Makefile, fence/agents/drac/Makefile, agents/ilo/Makefile,
    agents/wti/Makefile:
     - enable new agents.
    
    bin/Makefile:
     - install fence_drac5
     - install/uninstall fence library
    
    Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>