libxml-security and liblog4shib not found during installation

[Peter Schober]

* Paolo Santarsiero <paolo.santarsiero at gmail.com> [2016-11-15 16:37]:
> I'm installing Shibboleth 2.6 on Centos 6.7 x86_64 by yum, but it
> fails showing this error message:

See Scott's email from yesterday with the subject "RPM availability".
-peter