Authentication unstable when switching between 32-bit and 64-bit Java

When switching between 32-bit and 64-bit Java, kwscm svn authentication may become unstable. This is related to GNOME keyring support.

Workaround: After switching Java VMs, back up your existing authentication keys, and allow the system to regenerate new ones for you:

1. $ cd ~/gnome2/keyrings/
2. $ mv login.keyring login.keyring.backup
3. $ mv default default.backup
4. $ mv default.keyring default.keyring.backup