Revert "Add jsonschema to requirements.txt"
Revert "Add jsonschema to requirements.txt"

This reverts commit d35a64499673c2d765dd342fa21dabdbfa4ba276.

Which is possibly the cause of grenade failing the gate, we'll
bring this back later if it isn't.

Change-Id: I00815f7ef053ae4d5da71fa31885a52ae887c6fc

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