…e translog

When a replica processes out of order operations, it can drop some due to version comparisons. In the past that would have resulted in a VersionConflictException being thrown and ignored higher up. We changed this to have a cleaner flow that doesn't use exceptions. However, when backporting that change from master, we also back ported a change that isn't good for 5.x: we started storing these out of order ops in the translog. This is needed for the sequence number push, which also gives us some mechanism to deal with it later on during recovery. With the seq# this is not needed and can lead to deletes being lost (see test).

…ale_ops_in_translog

…ale_ops_in_translog

…ale_ops_in_translog