MFC 261512,261514:
- Partially revert r52493 and change client side interval statistics to
  report the actual number of RPCs issued, not the theoretical number
  that would be issued if all caching was disabled.
- Use the DELTA() macro to tidy the server-side interval stats code a bit.
MFC r257883:

	Add support for SIIG x1 pci-e single parallel port card (JJ-E01211-S1)

PR:		kern/182217