contrib/server-repl-plugin: Improved explanation of the parameter...

contrib/server-repl-plugin: Improved explanation of the parameter babudb.repl.policy in the default config files.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3504 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534