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This change set adds a random string suffix to TXT DNS record in le_dns_api() function (in letest.sh). Although the tests run sequentially, for some reason, I was encountering record conflict when running the DNS tests in acme.sh (PR: acmesh-official/acme.sh#5110). It seems like sometimes a test would start inserting before the previous tests cleans up the record. I guess it would not hurt having a random content for the record content.