correctly position end of row
correctly position end of row

In a testament to how confusing our old code was, while collapsing the futures
I ended up getting the end_of_row element inside the loop for clustered keys.
The end of row, as the name implies, should only be written at the end of the
(thrift) row (= CQL partition).

Move it to the right place.

Signed-off-by: Glauber Costa <f8b79557d19b40666ebe336545a0b6178af65685@cloudius-systems.com>

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