fix ShowDriverDeprecationNotification config setting

[Pradip-Khakurel]

fix #4161:
WantShowDriverDeprecationNotification property seems like a mistype in the console message. The real setting is ShowDriverDeprecationNotification but it needs to be added in the list of configurable settings (the variable settings in config.go). I could have renamed everything to WantShowDriverDeprecationNotification but it seems easier and still very readable that way.

User test:

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[fenglixa]

xhyve driver was already removed. I believe this fix is not cover the full story, but just the error output of "Property name WantShowDriverDeprecationNotification not found"

[afbjorklund]

/ok-to-test

[afbjorklund]

@fenglixa : removing the deprecated drivers is a different topic

[sharifelgamal]

LGTM. We'll merge this once tests pass.