Upgraded to EOS 4.4.19-20190110174740gitfbc6ddc to get the default value of...

Upgraded to EOS 4.4.19-20190110174740gitfbc6ddc to get the default value of off for filearchivedgc and the resetting of retrieve extended attributes.

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

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 1:python2-xrootd-4.9.0-0.rc1.el7.*
 1:python3-xrootd-4.9.0-0.rc1.el7.*
 1:xrootd-4.9.0-0.rc1.el7.*