Updating xrootd to commit cf0d6365 that should fix our frontend race

condition.

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

@@ -9,22 +9,21 @@
 0:eos-srm-4.1.26-20170824172038gitc7cf4c6.el7.cern.x86_64
 0:eos-test-4.1.26-20170824172038gitc7cf4c6.el7.cern.x86_64
 0:eos-testkeytab-4.1.26-20170824172038gitc7cf4c6.el7.cern.x86_64
-1:xrootd-4.7.0-1.el7.x86_64
-1:xrootd-client-4.7.0-1.el7.x86_64
-1:xrootd-client-devel-4.7.0-1.el7.x86_64
-1:xrootd-client-libs-4.7.0-1.el7.x86_64
-1:xrootd-debuginfo-4.7.0-1.el7.x86_64
-1:xrootd-devel-4.7.0-1.el7.x86_64
-1:xrootd-doc-4.7.0-1.el7.noarch
-1:xrootd-fuse-4.7.0-1.el7.x86_64
-1:xrootd-libs-4.7.0-1.el7.x86_64
-1:xrootd-private-devel-4.7.0-1.el7.x86_64
-1:xrootd-python-4.7.0-1.el7.x86_64
-1:xrootd-selinux-4.7.0-1.el7.noarch
-1:xrootd-server-4.7.0-1.el7.x86_64
-1:xrootd-server-devel-4.7.0-1.el7.x86_64
-1:xrootd-server-libs-4.7.0-1.el7.x86_64
-1:xrootd-tests-4.7.0-1.el7.x86_64
+1:xrootd-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-client-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-client-devel-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-client-libs-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-debuginfo-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-devel-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-doc-20170918.cf0d636-1.el7.cern.noarch
+1:xrootd-fuse-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-libs-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-private-devel-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-python-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-selinux-20170918.cf0d636-1.el7.cern.noarch
+1:xrootd-server-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-server-devel-20170918.cf0d636-1.el7.cern.x86_64
+1:xrootd-server-libs-20170918.cf0d636-1.el7.cern.x86_64
 2:ceph-12.2.0-0.el7.x86_64
 2:ceph-base-12.2.0-0.el7.x86_64
 2:ceph-common-12.2.0-0.el7.x86_64