Defend leap.request(), generate() from garbage collection.

Earlier we had blithely designated the 'pending' list (which stores
WaitForReqid objects for pending request() and generate() calls) as a weak
table. But the caller of request() or generate() does not hold a reference to
the WaitForReqid object. Make pending hold "strong" references.

Private collections (pending, waitfors) and private scalars that are never
reassigned (reply, command) need not be entries in the leap table.

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