MFC r320419, r337679, r338366, and r338652.
r320419:
cxgbe/iw_cxgbe: Disable debug output by default. The help text for the sysctl
already says that the default is 0.
r337679:
Remove unused stuff from iw_cxgbe.h
r338366:
cxgbe/iw_cxgbe: Fix iWARP RDMA + VIMAGE operation by setting the VNET
properly in a couple of places in the driver.
r338652:
cxgbe/iw_cxgbe: Fix reported build breakage when the kernel
configuration has "device cxgbe' but no VIMAGE.
Sponsored by: Chelsio Communications