Tooling to move table out of FAILED_OPEN state

Playing with rsgroup feature, I was able to manufacture a state where assignment landed regions into a FAILED_OPEN state; i.e. assignment could not complete (in this case because no server for the region to land on inside its rsgroup). Once in this FAILED_OPEN state, the only way currently (seemingly) to move it on from this state is to manually assign the region. If table is large, this is burdensome. FAILED_OPEN seems a legitmate endpoint for AM to dump regions into if it can't do anything with them. We need tooling for 'fix'. One thought is that assign take a tableName.

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