Revert "stopped reporting individual partitions in CollectionMap::getNamespaces #997"

This reverts commit 81b28cad7e0f0bd365275fd088ecf8b6387850ba.
refs #998, fix PartitionedCollection::rebuildIndex to not call update_ns and therefore not pollute the metadata db
Merge branch 'bugfixes/tokumx-1.4' into releases/tokumx-1.4