client: RPC Client:

- Made client IPv6 ready: Parsing of hostname and port from service address had to be fixed (string was splitted at first and not at the last colon).
- Disabled Visual Studio warning C4996.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3571 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534