-Fix problem where data worker mode rendered cached operation useless
-Improved performance of data worker IPC communication (one benchmark went from 40 seconds to 2 seconds)
git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@3969 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd