Fix svn keyword.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/vfs@1451595 13f79535-47bb-0310-9956-ffa450edef68
Support private key files with passphrase (VFS-283) and additional public key.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/vfs@1451622 13f79535-47bb-0310-9956-ffa450edef68