The config replication and oplog commitment safety checks during reconfig currently use the kConfigMajority write concern mode and a numeric write concern with the majority count of voting nodes. These mechanisms for satisfying write concern do not properly exclude non-voting nodes from the majority count. We should utilize the tag system (e.g. kInternalVoterTagName) to make these majority checks correctly exclude non-voting nodes. Javascript test repros of the bugs are attached.