qa/bpftrace/service_tests.py: missed changes from last commit
qa/bpftrace/service_tests.py: missed changes from last commit

hz:9999 -> hz:999 and 64 -> 4 for max_throughput ... both appear in
TWO places in this Python source file.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp