LongConcurrentLRUMap: revert sweepLock removal, this is necessary for concurrency
LongConcurrentLRUMap: revert sweepLock removal, this is necessary for concurrency

cocosli/mapdb,jankotek/mapdb,jankotek/MapDB,olupas/MapDB,ringoluo/mapdb,codeaudit/mapdb,ffjiao/mapdb,jankotek/mapdb,binarytemple/mapdb,lamfire/mapdb,SleimanJneidi/mapdb,olupas/MapDB,sumit784/mapdb,jankotek/MapDB,mebigfatguy/mapdb,hangum/mapdb,mebigfatguy/mapdb,pettermahlen/mapdb,morfeo8marc/mapdb