client: Reverted changes from revision 3385 because it broke the...

client: Reverted changes from revision 3385 because it broke the async_write_handler_test. After all, it might not be necessary. Instead, it makes more sense to add a call to FileInfo::WaitForPendingAsyncWrites().

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3522 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534