Protecting context structures with mutex.

By design, Unit context is created for the thread which reads messages from
the router.  However, Go request handlers are called in a separate goroutine
that may be executed in a different thread.  To avoid a racing condition,
access to lists of free structures in the context should be serialized.  This
patch should fix random crashes in Go applications under high load.

This is related to #253 and #309 issues on GitHub.

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