ioq: Add basic definitions for a shared-memory, lockless queue

IOQ allows asynchronous communication between two end-points via a common
shared-memory region.  Memory is synchronized using pure barriers (i.e.
lockless), and updates are communicated via an embedded shm-signal.   The
design of the interface allows one code base to universally provide both
sides of a given channel.

We will use this mechanism later in the series to efficiently move data
in and out of a guest kernel from various sources, including both
infrastructure level and application level transports.

Signed-off-by: Gregory Haskins <ghaskins@novell.com>

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