confmgt: include variable name in all complaints.
When we give a msg about failing to parse a variable, we should say what the variable was, and ideally what was wrong with it.
Compare the results for running ./src/app/tor UseBridges 99 in 0.3.5 and in master. With 0.3.5 you got: Boolean 'UseBridges 99' expects 0 or 1. but now you get Unrecognized value 99.
Let's make that better.
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