test: adapted test servers according to review...

test: adapted test servers according to review (http://code.google.com/p/xtreemfs/source/detail?r=2988)

git-svn-id: https://xtreemfs.googlecode.com/svn/branches/mno-async_writes@2991 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534