In SERVER-43614 we introduced a new failpointMsg field in currentOp output, intended to replace the user-visible msg field for internal use by tests that must wait for an operation to hit a particular failpoint. However, this caused tests to begin failing in multiversion suites because the last-stable members of the replica set never produce a field called failpointMsg.

We should update jstests/libs/curop_helpers.js to look for both field names in currentOp output, and un-blacklist the tests blacklisted under SERVER-48036.