If CBF value is not set, then netmap package uses default CBF
value. However it modifies placement policy structure in
`GetContainerNodes()` because policy passed as a pointer.
Instead package can store CBF value in internal context and use
it without policy modification.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
When selector attribute is provided it should be
silently replaced by transparent ID, so each node
resides in a separate bucket.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
