[mongodb] Added log4j properties for mongodb to not show debug output as default
[mongodb] Added log4j properties for mongodb to not show debug output as default

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