NEX-1643 dtrace provider for smbsrv
Also illumos 1841:
 DTrace smb provider was mis-implemented, doesn't exist.
Add back handlers for read/write raw, so that
 legacy dtrace consumers can find the probes.
Kill extra arg in smb_negotiate
Fix missing "done" probe with smb_notify
Add example consumer: smb-trace.d
fix soi_pid

@@ -92,10 +92,11 @@
         procfs.d \
         regs.d \
         sched.d \
         signal.d \
         scsi.d \
+        smb.d \
         srp.d \
         sysevent.d \
         tcp.d \
         udp.d \
         unistd.d