-1 tablet log id used in WAL when table durability is set to None

[keith-turner]

When a tables durability is set to none tablets get a tablet log id of -1. The durability can be set per batch writer and the table setting can be changed. Howerver when this change in durability happens, the tablet id in the WALs is still -1. This means that a tablet may recover data from other tablets because multiple tablets would be mapped to the same id of -1.

I discovered this with changes I made for #458. My changes caused an IT to fail with this pre-existing bug. This bug may have existed since 1.7.0. This bug would only be seen when setting table.durability=NONE and then later changing it to something else.