Update git submodules
* Update oslo.reports from branch 'master' to 592d8ac51a7286ee7bc38676e6c18d383976f986 - Merge "Make greenlet optional" - Make greenlet optional The greenlet library is not always used. It is used to capture detail of green threads but this part can be skipped in case greenlet is not present. Also eventlet in test requirements is not used and can be removed. Change-Id: I57edfe4d975ce42ca92a9242d4b32e69d1cec268
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