Upgraded to EOS 4.3.12-20180915230621gitef0ac7d to avoid segmentation faults occurring in the FSTs

continuousintegration/docker/ctafrontend/cc7/etc/yum/pluginconf.d/versionlock.list

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 1:python2-xrootd-4.8.2-1.el7.*
 1:python3-xrootd-4.8.2-1.el7.*
 1:xrootd-4.8.2-1.el7.*