remove bin/perftest.sh (#4374)
remove bin/perftest.sh (#4374)

Automatic merge from submit-queue.

remove bin/perftest.sh

This is not used, and bin/perfcheck.sh seems more preferable.
This PR also adds some baselines for benchmark tests.

Fixes #3869
istio/pkg,istio/pkg,istio/pkg,istio/pkg,istio/pkg