CernVM-FS 2.11 Released

CernVM-FS 2.11 is released. Version 2.11 is a feature release that
comes with new functionality, performance improvements, and bugfixes.
Please see the release notes for full details (the usual sphinx style on readthedocs will be restored shortly):

 https://cvmfs.readthedocs.io/en/2.11/cpt-releasenotes.html