Drop unicode shenanigans from DevServer

The 'weeee' factor of showing cute unicode isn't worth it if it means
we're more likely to break on systems where the default encoding for
stdout is not UTF-8.

Change-Id: Iaaa5c36f39140c6e6e15f16ab0518cc12076fa2d
Default schema value: 'UKNOWN' => -1

'UNKNOWN' is a string type, whereas the capsule schema stipulates
integers.

Change-Id: Ibbecc04ef7edd3ac75dca83394d80d9ce04bad76