[AccessController] Restore compatible early-out access denial

Prior to 0.98.0 if a user was not granted access to a column family or partial access (qualifier grants), then the AccessController would immediately throw back an AccessDeniedException. This behavior was changed in 0.98.0 to allow cell level ACLs to grant exceptional access. The user will no longer see an exception; instead the scanner will return result sets only including cells which grant exceptional access. If no such cell level grants are made, then the scanner will return the empty result set. This change introduces a configuration setting which restores the pre-0.98.0 behavior. It can be set in the site file for global effect, or per table using HTableDescriptor#setConfiguration. This setting is AccessControlConstants.CF_ATTRIBUTE_EARLY_OUT ("hbase.security.access.early_out"), a boolean. Set to "true" for backwards compatible behavior. As a consequence if there are no grants at the CF level then an AccessDeniedException will be thrown immediately, and cell ACLs will be ignored, unless the cell-first ACL evaluation strategy is used (toggled via Query#setACLStrategy). This change also repairs a defect related to audit logging. In all cases, compatible behavior or not, indications of successful or failed access attempts will be logged.