also remove what has been upstreamed.
also, logic of how upstream has implements dealing with pending packets
on the socket is different now and therefore needs testing.

minor change:
- patches are now done in order.
- all configs are moved to config_site.h; TODO: also move HOSTVARS to use.mak
- enable epoll on linux

Change-Id: I87b9389a845d4c4a41fc9e70c3a94a0a990ca83d