AzkabanProcess uses misleading log level to log statements for Pig and Hive jobs - issue #282

From Azkaban process's perspective, it makes sense to log out the log statements from the subprocess using INFO level.  

For some reason the log statements from Pig and Hive are sent through the error stream.  So it is necessary to redirect the standard output and error output to the same stream.
We should grep through the codebase for similar comments at some point. :)