Currently nodeselection package only contained state for uploads, move
these to a subpackage, such that we can make another "downloadselection"
for downloads. Then move selection logic from overlay to nodeselection.
Change-Id: I0fc42bcae3a29db2728dae9f3863b1e95bf5165b
* Deduplicate NodeID list prior to fetching IPs.
* Use NodeSelectionCache for fetching reliable IPs.
* Return number of segements, reliable pieces and all pieces.
Change-Id: I13e679caab275488b4037624b840a4068dad9589
Currently node selection cache is biased towards the same subnet. This
implements static node selection for distinct such that it selects with
equal probability subnets rather than id-s.
This is mostly a copy paste + modifications from previous node selection
state.
Change-Id: Ia5c0aaf68e7feca78fbbd7352ad369fcb77c3a05
