Infrastructure

Please enhance existing and develop new documentation for both client and server side certificate management from the Member Node perspective.

See:
http://jenkins-1.dataone.org/jenkins/job/DataONE-Operations-Manual/ws/operations/_build/html/member_node_deployment/Certificates.html?highlight=certificate

http://jenkins-1.dataone.org/jenkins/job/DataONE-Operations-Manual/ws/operations/_build/html/member_node_deployment/registration.html#obtain-a-client-side-certificate

http://jenkins-1.dataone.org/jenkins/job/DataONE-Operations-Manual/ws/operations/_build/html/cnDevSetup.html?highlight=certificate

At various user levels, we need:
1-an overview of the concept of certificates in general and server- vs client-side certificates
2-instructions on how to obtain and install server- and client-side certificates