Cherry-picked julien's correction of CI

continuousintegration/docker/ctafrontend/cc7/etc/yum.repos.d/eos-citrine-depend.repo

 [eos-citrine-depend]
 name=EOS Citrine depend
 baseurl=http://storage-ci.web.cern.ch/storage-ci/eos/citrine-depend/el-7/x86_64/
-protected=1
-priority=2
+priority=4
 gpgcheck=0
 enabled=1