test: bug rolling update clear

[cristianmtr]

if you remove from tests/integration/test_hnsw_psql.py

L:180

        if benchmark:
            f.post('/clear')

the test test_benchmark_basic fails when it runs the second case

even though clear is called at the beginning of the flow.

Why?

yes, /clear only hits one replica. but when we restart the flow there should be completely new replicas anyway