unit-test-long failed on Ubuntu 18.04

Host: ec2-100-25-33-206.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-5583 Fix a dead lock in eviction server flow (#5325)

• WT-5583 Fix a deadlock in eviction server flow

In the eviction server code flow when there are no eviction workers,
the server itself try to evict the pages, during the page eviction
flow it try to take the lock which itself is already held leads to
a deadlock.

A fix is to release the lock before evicting the page from the queue
and take back the lock once it finishes processing the queue.

• Temporarily disable the failing rollback to stable check of hs values | 28 Feb 20 03:20 UTC
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