Improve logging of HTTP connection errors
Discard incoming non-OPTIONS requests if queue is too large
Improve logging and retry behaviour on Homestead (and Homer) lookup failures
Remove rough overload control code (moved to an experimental branch
Merge remote-tracking branch 'remotes/origin/issue144' into hydrogen

Conflicts:
	sprout/stateful_proxy.cpp
	sprout/ut/hssconnection_test.cpp
Dont delete references