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Functional tests started to fail with "Too many open files" randomly, the default ulimit in OS is configured to 1024, increasing this to 4096 to avoid these random failures. Closes-Bug: #2080199 Change-Id: Iff86599678ebdd5189d5b56d11f3373c9b138562 (cherry picked from commit 6970f39a49b83f279b9e0479f7637d03a123a40e)