Add paths for hadoop-1.2.1-1 on CentOS6

I'm not sure if this is PR is appropriate or not.

I'm using an official hadoop-1.2.1 rpm from http://www.mirrorservice.org/sites/ftp.apache.org/hadoop/common/hadoop-1.2.1/hadoop-1.2.1-1.x86_64.rpm

and the paths to the hadoop jars aren't detected by pydoop:
```
/usr/share/hadoop/
/usr/share/hadoop/lib
```