[asynchbase] Fix Netty library version issue that prevents it from loading outside the unit tests.
[asynchbase] Fix Netty library version issue that prevents it from
loading outside the unit tests.

leschekhomann/YCSB,cricket007/YCSB,zyguan/ycsb,cricket007/YCSB,cricket007/YCSB,madhurihn/YCSB_ToyDB,ChristianNavolskyi/YCSB,manolama/YCSB,jaemyoun/YCSB,ChristianNavolskyi/YCSB,leschekhomann/YCSB,brianfrankcooper/YCSB,madhurihn/YCSB_ToyDB,manolama/YCSB,brianfrankcooper/YCSB,zyguan/ycsb,leschekhomann/YCSB,manolama/YCSB,madhurihn/YCSB_ToyDB,madhurihn/YCSB_ToyDB,cricket007/YCSB,jaemyoun/YCSB,leschekhomann/YCSB,zyguan/ycsb,ChristianNavolskyi/YCSB,brianfrankcooper/YCSB,ChristianNavolskyi/YCSB,manolama/YCSB,jaemyoun/YCSB,zyguan/ycsb,jaemyoun/YCSB,brianfrankcooper/YCSB