Streams should always send a full snapshot even if mutations past the end seqno are sent

1= Load and Stream 3 items.
2= Load 3 more items..
3= Perform partial stream request for first 4 mutations.
4= Repeat stream request in step 3 until stats show stream request contains items that were backfilled.

• On the backfilled request the socket recv times out waiting for mutations from producer
• Expected to receive available mutations from seqno's 0-4

There are some nuances here:
+ de-duplication is happening because all items in step1 have same key and all items in step2 have same keys but differ from step1.
+ if you request all 6 seqno's the test will pass, but fails for partial request of seqno's 0-4