SERVER-10599 cleanup_orphaned_cmd.js need to wait for migration to finish so test deterministic
SERVER-10597 autosplit_heuristics.js data count of high chunk reset to random on reload

make dummy high chunk in test
SERVER-10374 Disable sync only with special chars test due to SERVER-10344
SERVER-10499 ismaster1.js need to explicitly wait for secondary to ack master
SERVER-10597 autosplit_heuristics.js additional comment