SERVER-5436 improve ipv6 parsing in HostAndPort
SERVER-14442 Make ReplicationCoordinator responsible for constructing ReplSetUpdatePosition commands
SERVER-14550 Stop maintaining local.slaves
SERVER-14212 When restoring users and roles for a single db with --drop, don't drop users/roles from other databases
SERVER-14475 Cleanup the shutdown code and indicate shutdown earlier
SERVER-13961 Cleanup some nested instantiations of OperationContextImpl in repl

These are causing deadlocks if LockState is removed from TLS because of
pseudo-conflicting locks on the same code path.
SERVER-13961 Pass OperationContext into WhereCallbackReal

There are no functional changes in this commit, just preparation for the
subsequent one, which will add operation context to the JS execution
scope.
SERVER-14212 Fix test of _mergeAuthzCollections command by adding missing "db" field
SERVER-9790 SERVER-14554 (v8-3.25) Add this.$db || db.toString() to DBRef string representation
SERVER-14413 access global storage mgr via global environment
SERVER-14559 incorporating new ReplicaSetConfig class into topocoord

- removed Member*'s
- new temporary class NewMember, to be replaced by refactored HeartbeatInfo
SERVER-14586 add toBSON() methods to ReplicaSetConfig and MemberConfig classes
SERVER-14559 correct lint issue
SERVER-14624 Add isElectable and getNumVotes methods to MemberConfig.
SERVER-14624 Add isInitialized() concept to ReplicaSetConfig; expose some field name constants.
SERVER-12512: Add role-based, selective audit logging.
SERVER-14442 Implement getMyRID() in ReplicationCoordinatorImpl
SERVER-10448 fix candidate deletion in multi plan stage
SERVER-14560: Add cancelHeartbeats
SERVER-14517: Start of heartbeat