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vinyl: consolidate skip optimization checks in read iterator

Each kind of source iterator has 'skip' method, which is called to
position the iterator to a specified key. It is used to advance
sources that were skipped on the previous iteration (e.g. because
the result was found in the cache). The method has an optimization:
it avoids a lookup in the index if it is already positioned at a
statement following the specified key. This optimization makes the
method difficult to use if we want to keep a key history in each
source instead of a single statement, as we don't know whether 'skip'
changed the position or not and hence whether we need to rebuild key
history or not. Let's move the optimization to the read iterator and
make 'skip' plain and simple: let it always reposition the iterator
to the first statement following a given key.

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