Flaky-test: org.apache.bookkeeper.bookie.FileInfoBackingCacheTest testRaceGuavaEvictAndReleaseBeforeRetain is slow

[dlg99]

from CI log of the "Remaining Tests" job:

org.apache.bookkeeper.bookie.FileInfoBackingCacheTest
  Test testRaceGuavaEvictAndReleaseBeforeRetain PASSED (47m 41s)
  Test testRefCountRace PASSED (10.1s)
  Test basicTest PASSED
  Test testNoKey PASSED
  Test testForDeadlocks PASSED (10s)
org.apache.bookkeeper.bookie.ForceAuditorChecksCmdTest
  Test verifyAuditCTimeReset PASSED (2.1s)