mno-async_writes/client: Switched TestRPCServer* implementations from static...

mno-async_writes/client: Switched TestRPCServer* implementations from static methods to member functions (compilation broken, will be fixed by later commits).

git-svn-id: https://xtreemfs.googlecode.com/svn/branches/mno-async_writes@2979 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534