initial set of HPN changes

Based on :
158-hpn-13-openssh-6-1-server-logging
161-hpn-13-openssh-6-1-dynamic-window-and-none-switch

skipping
160-hpn-13-openssh-6-1-threaded-ctr-cipher-mode

for historical stably reasons and because that section of code has seen
tremendous revision as of late.