Network fixes

[magik6k]

From @magik6k on December 9, 2015 16:56

• Fix host discovery in new racks
• Host timeouts
• Fix route seeking issues
• Route request timeouts
• Route timeout/recheck(remove if not used for x time, requests include age, re-request after some time)
• Re-implement TCP to implement more of actual TCP
• Port back to OpenOS

Copied from original issue: StarChasers/Plan9k#5