Improved password encryption for VCS users and agents

The VCS component now uses the AES-256 algorithm to encrypt the VCS user and the VCS agent passwords by default, for enhanced security. The vcsencrypt utility and the hauser command generate passwords that are encrypted by using the standard AES-256 algorithm.

This change is backward compatible and does not affect any upgrade scenarios. Passwords that were configured earlier with the proprietary Veritas encryption algorithm are honoured. However, when a password for an existing user (in the non-secure mode) or an agent is changed, it is encrypted with the AES-256 algorithm.

For details, refer to the Cluster Server Administrator's Guide.