client: default to None auth if no auth in config

Defer warning until discovery fails.
Also fix SetupAuth error checks in camtool.

Change-Id: Ib554595603994e929d465e4e0de6acaf319d5b42
Starting to fool around with property sheet UI

Looks like: http://i.imgur.com/HxE1oFi.png

Change-Id: Id3188148fd1ef97dac16a53e96ebe41f64cf1ee7
Merge "Starting to fool around with property sheet UI"
Merge "client: default to None auth if no auth in config"
cmdmain, camput: PreExit should always run, not just in verbose mode

Change-Id: I6001a3474071a00f0ab56b031ac8c5504e5e9da5