This reverts commit bfe7885a.

The commit caused build failures on Hadoop 2.2 profile:

```
[error] /scratch/rxin/spark/core/src/main/scala/org/apache/spark/util/Utils.scala:1489: value read is not a member of object org.apache.commons.io.IOUtils
[error]       var numBytes = IOUtils.read(gzInputStream, buf)
[error]                              ^
[error] /scratch/rxin/spark/core/src/main/scala/org/apache/spark/util/Utils.scala:1492: value read is not a member of object org.apache.commons.io.IOUtils
[error]         numBytes = IOUtils.read(gzInputStream, buf)
[error]                            ^
```