Amnon Heiman c96c3ce9e8 tests/query_processor_test: add query_with_consumer_test
This patch adds a unit test for querying with a consumer function.

query with consumer uses paging, the tests covers the scenarios where
the number of rows bellow and above the page size, it also test the
option to stop in the middle of reading.

Signed-off-by: Amnon Heiman <amnon@scylladb.com>
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Scylla

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$ git submodule update --init --recursive
$ sudo ./install-dependencies.sh
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$ ./build/release/scylla
$ # Rejoice!

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# Add user to the "mock" group:
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INFO: Results and/or logs in: /var/lib/mock/fedora-21-x86_64/result

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