Lengthen watchdog timers and poll rings directly.

The mpe-ethernet test was causing too many watchdog warnings. I
think the watchdog code could still be improved but this should
stop the log spew.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Make transmitter stats 64-bits wide.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Merge pull request #18 from pauldu/master

Couple of patches