TACHYON-15 Tachyon shell hang when trying to get multi blocks file.

TACHYON-15 Tachyon shell hang when trying to get multi blocks file.

How to repro:
1. Change block size to 8MB
2. ./bin/tachyon tfs copyFromLocal "./core/target/tachyon-0.6.0-SNAPSHOT-jar-with-dependencies.jar" "tachyon://henry-pivotal.local:19998/tachyon-0.6.0-SNAPSHOT-jar-with-dependencies.jar"
3. ./bin/tachyon tfs fileinfo tachyon-0.6.0-SNAPSHOT-jar-with-dependencies.jar
4. ./bin/tachyon tfs copyToLocal "tachyon-0.6.0-SNAPSHOT-jar-with-dependencies.jar" "/Users/hsaputra/Documents/tachyon-0.6.0-SNAPSHOT-jar-with-dependencies.jar"
wrap in try/finally