tests: perf_simple_query: Add delete perf test
tests: perf_simple_query: Add delete perf test

Add a performance test for deletion in addition to the existing update
and query tests. The deletion performance test is executed using the
'--delete' argument to perf_simple_query.

Fixes #2417.

Signed-off-by: Etienne Kruger <4f1ea4f09db2aaafb0a92c0b9e57751121ed6647@loadavg.io>
Message-Id: <20170615232500.26987-1-4f1ea4f09db2aaafb0a92c0b9e57751121ed6647@loadavg.io>

avikivity/scylla,scylladb/scylla,scylladb/scylla,duarten/scylla,duarten/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla,duarten/scylla