libvirt.spec: remove duplicate files from -docs package
    
    Previous commit moved some lists out of the -devel package
    and into the -docs package
    
      commit feffcc03a0d3690dcffd860682dcbaa61d726b39
      Author: Cole Robinson <crobinso@redhat.com>
      Date:   Wed Apr 13 10:37:42 2016 -0400
    
        spec: Only pull in API docs with -devel package
    
    What was not realized is that the rule 'libvirt-docs/*'
    and ' docs/*.html docs/html docs/*.gif' actually point
    to the exact same content. ie, we had previously included
    the website HTML in *both* the -docs and -devel packages.
    
    So this change ended up listing the files twice, which
    caused RPM to print a load of warnings:
    
    warning: File listed twice: /usr/share/doc/libvirt-docs/html
    warning: File listed twice: /usr/share/doc/libvirt-docs/html/32favicon.png
    warning: File listed twice: /usr/share/doc/libvirt-docs/html/404.html
    warning: File listed twice: /usr/share/doc/libvirt-docs/html/acl.html
    warning: File listed twice: /usr/share/doc/libvirt-docs/html/aclpolkit.html
    
    Signed-off-by: Daniel P. Berrange <berrange@redhat.com>