After SERVER-26008, in mongos and mongod failpoints can be:

• set on the command line via --setParameter (but not at runtime via the setParameter command)
• set at runtime via the configureFailPoint command
• read at runtime via the getParameter command, but no longer via the configureFailPoint command

We should remove the configureFailPoint command entirely and instead read/write failpoints using --setParameter and the setParameter/getParameter commands.