修复BUG: DataManagerTest中worker的uidsLock未释放，导致testDMMulti卡死

[qk-antares]

DataManagerTest中worker的else分支uidsLock未释放，在真实的new Thread(r).start()多线程测试环境下，testDMMulti会卡死，该版本修复了这个BUG

原代码：
uidsLock.lock();
if(uids0.size() == 0) {
uidsLock.unlock();
continue;
}
int tmp = Math.abs(random.nextInt()) % uids0.size();
long u0 = uids0.get(tmp);
long u1 = uids1.get(tmp);

修复后：
long u0, u1;
uidsLock.lock();
try {
if (uids0.size() == 0) {
continue;
}
int tmp = Math.abs(random.nextInt()) % uids0.size();
u0 = uids0.get(tmp);
u1 = uids1.get(tmp);
} finally {
uidsLock.unlock();
}