server: libxtreemfs for Java:

- Fixed adding read-only replicas.
- Fixed missing initialization of member "volume".
- Added "final" specifier to all relevant member values.
- Added missing space in output "Flush did not succeed since ...".

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3539 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534