"Didn't affect any release. Regression introduced in 301358e.
Fixes#3041"
* 'resharding_fix_v4' of github.com:raphaelsc/scylla:
tests: add sstable resharding test to test.py
tests: fix sstable resharding test
sstables: Fix resharding by not filtering out mutation that belongs to other shard
db: introduce make_range_sstable_reader
rename make_range_sstable_reader to make_local_shard_sstable_reader
db: extract sstable reader creation from incremental_reader_selector
db: reuse make_range_sstable_reader in make_sstable_reader