Starting to allow for >1 implementation of pollset within a binary.
Do so without requiring an extra allocation for completion queues (which
we could not tolerate).
Fold endpoint interface into iomgr, move secure_endpoint into security/.
This will make it easier for endpoint to rely on some iomgr defined types (like
pollset).
Change on 2014/12/17 by ctiller <ctiller@google.com>
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=82338036
Craig Tiller