Probes broken on recent Omnios for zilstat

[oninoshiko]

We talked about this privately, but I wanted to officially report it here so there is a record of it. It seems there has been changes to the probes in recent versions.

on omnios-r151030 I'm seeing the following errors when I run zilstat:

dtrace: failed to match fbt::zil_lwb_write_start:entry: No probe matches description unknown fbt::zil_lwb_write_start arguments