databases/cego: update 2.54.9 -> 2.54.16

• rework tableset verification procedure
• removed logback.xml to avoid logging side effects
• Added admin command "verify locks" to perform a test aquire of all lock manager locks read and write
• Fix CegoQueryHelper::maxFieldSize. The returned size must be at least MAX_NULL_LEN
• CegoTableManager::checkBTreeIntegrity support for allowDuplicateNull feature ( multiple null values in unique btree )
• CegoLockHandler, check for unlock methods to check for lockId == 0
• Completed verify locks command with missing pool, querycache, tablecache, db and xml locks
• CegoClient: query abort via interrupt character fixed