Delegate unconstrained table endpoint to constrained table endpoint

[ghost]

https://github.com/yahoo/fili/pull/439 implemented a new table endpoint - /{tableName}/{granularity}/{dimensions:.*}. Just like how data endpoint delegates /{tableName}/{timeGrain} request to /{tableName}/{timeGrain}/{dimensions:.*} endpoints, we should do the same for /{tableName}/{granularity} endpoint, because the two share almost the same lines of code