(maint) Merge up 0ba504c to 6.x
(maint) Merge up 0ba504c to 6.x

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* commit '0ba504cefe6b00e366d1095750fc92f67db6392c':
  (SERVER-2859) Add docs for certificate clean endpoint

puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppet-server,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver