tester: add support for bsl operation
tester: add support for bsl operation

also used in https://github.com/erlang/otp/commit/d1d26f4bf9da3cc5eab4e918df771d67fe9e6bb5

scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris