[solr] tune down log output during tests.
[solr] tune down log output during tests.

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