disable sgmlop import in rhn_check

sgmlop.so from python-reportlab breaks rhn_check's ability to run remote commands
for details see
https://www.redhat.com/archives/spacewalk-list/2014-July/msg00074.html
https://www.redhat.com/archives/spacewalk-list/2014-October/msg00055.html
Automatic commit of package [rhn-client-tools] release [2.3.3-1].