8186044: [TESTBUG] DumpSharedDictionary test sometimes fails in JPRT Summary: wrap test in CDSTestUtils.isUnableToMap(out) Reviewed-by: iklam, mseledtsov

^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
.DS_Store
.metadata/
.recommenders/