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

*** 380,402 ****
                          negprot->ni_dialect = dialect;
                          negprot->ni_index = pos;
                  }
          }
  
!         DTRACE_SMB_2(op__Negotiate__start, smb_request_t *, sr,
!             smb_arg_negotiate_t, negprot);
  
          return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
  }
  
  void
  smb_post_negotiate(smb_request_t *sr)
  {
          smb_arg_negotiate_t     *negprot = sr->sr_negprot;
  
!         DTRACE_SMB_2(op__Negotiate__done, smb_request_t *, sr,
!             smb_arg_negotiate_t, negprot);
  
          bzero(negprot, sizeof (smb_arg_negotiate_t));
  }
  
  smb_sdrc_t
--- 380,400 ----
                          negprot->ni_dialect = dialect;
                          negprot->ni_index = pos;
                  }
          }
  
!         DTRACE_SMB_1(op__Negotiate__start, smb_request_t *, sr);
  
          return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
  }
  
  void
  smb_post_negotiate(smb_request_t *sr)
  {
          smb_arg_negotiate_t     *negprot = sr->sr_negprot;
  
!         DTRACE_SMB_1(op__Negotiate__done, smb_request_t *, sr);
  
          bzero(negprot, sizeof (smb_arg_negotiate_t));
  }
  
  smb_sdrc_t