Describe prints the type and NodeID of the configuration changes as a space-delimited string.

Restore takes a Changer (which must represent an empty configuration), and runs a sequence of changes enacting the configuration described in the ConfState.

ValidateProp validates a proposed ConfChange against the current state of the Raft group.

Changer facilitates configuration changes.

ValidationContext is a context struct that that is passed to ValidateProp to allow it to validate a proposed ConfChange against the current state of the Raft group.