vfs/poll: add proper handling for sem_timedwait errnos.  From Jussi Kivilinna
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apps/examples/bridge:  Add host-side test driver
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apps/examples/bridge:  Fixes some bugs in test driver.  Still does not work
apps/examples/bridge:  Lots of fixes.  I think it is working although I have still have host firewall issues in testing
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Network: Add a file of IPv6 globals
Network:  Add logic to get a default network device (for the case where are multiple devices).  For INADDR_ANY
File missed in previous commit
Some ideas for how port assignments might work with multiple network interfaces
Network: Misc changes to UDP bind logic for the case of multiple networks
Fix routing of muli-network UDP packets
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Update TODO
Make tcp_listener static scope; it is not used outside of tcp_conn.c
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Back out a misconception about INADDR_ANY introduce with some previous commits
Fix UDP routing error in last commit
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