Allow isMaster to report the wire version (range) it expects

The version of the wire determines if two agents of the system (driver, servers, and mongos) can interact. For each agent, there is a version that they are at (max) and there is a minimum version that they are compatible with. If two agents have on overlap of a version, they can talk. In practice, this may prevent a too old server to join a cluster or a too old application to talk to a server.

Each agent has a fixed range that never changes.

For a mongod and a mongos, the version will be reported on the 'isMaster' command:

'isMaster.maxWireVersion' reports the version the mongod/s are at
'isMaster.minWireVersion' reports the oldest version that the mongod/s can understand

For now, versions are only going to be reported on 'isMaster'.