[SERVER-20915] Resolve shell readMode on connection open - MongoDB

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Transcript below edited to show keystrokes. Of course, it's only when connected to an older mongod/mongos, and only the first time tab is used.

$ /m/3.1.9/bin/mongo --norc

MongoDB shell version: 3.1.9

connecting to: test

> db.version()

2.6.10

> db.serverS<Tab>Cannot use 'commands' readMode, degrading to 'legacy' mode

  db.serverStatus(<Enter>

...<Enter>

...<Enter>

> db.serverS<Tab>tatus(

is related to

SERVER-22440 Shell incorrectly issues first query in legacy read mode

SERVER-21745 Shell outputs diagnostic information in batch mode even with --quiet when talking to older mongod versions

SERVER-21119 Better behavior for shell with readMode "commands" and find() when switching to an older server

related to

DOCS-8642 Document "Legacy" and "Compatibility" mode

SERVER-19572 Change shell default read mode to "compatibility"