Added build target for Redis backend.
Added build target for Redis backend.

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