configure-combinations failed on ! Ubuntu 18.04

Host: ec2-3-93-218-216.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-6674 Remove async API. (#6026)

• WT-6674 Remove async API.

• Remove rest of EBUSY_OK in python.

• Add strings back to s_string.ok for NEWS file.
  Fix python input file to fully remove async op extension code.

• Remove unused variables in wtperf.

• Remove async test from test_reconfig01.py.

• Remove ex_async from SConstruct

• Remove Java async from SConstruct

• Add line to upgrading.dox.

• Remove async in more places from review.

• Fix python list | 25 Sep 20 02:38 UTC
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