Regenerates the value of the instance_rand configuration property.
When the ra_regenerate_keys command is invoked, all encrypted passwords in the user-info and password tables are reencrypted. However, the unencrypted values do not change.
When the ra_regenerate_keys command is invoked, the date of creation (ctime) attribute in the encryption keys table is set to the time of execution of ra_regenerate_keys.