Bug 756533 - Slightly revert logging changes from 96d0d221bb3d297b4af1bcb9e66ebe614f351533.
Bug 756533 - Slightly revert logging changes from 96d0d221bb3d297b4af1bcb9e66ebe614f351533.

This increases the logging threadshold to just errors and reintroduces
the RequireDebugFalse filter for the admin email log handler.

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