* bus/driver.c: Add GetAdtAuditSessionData method
	which returns audit data for a connection.
	* configure.in: Detect ADT auditing support
	* dbus/dbus-auth.c: Read ADT auditing creds.
	* dbus/dbus-connection.c: Implement
	dbus_connection_get_adt_audit_session_data.
	* dbus/dbus-connection.h: Export it.
	* dbus/dbus-credentials.c: Add support for
	gathering adt_audit_data and retrieving it
	via _dbus_credentials_get_adt_audit_data.
	* dbus/dbus-credentials.h: Add
	DBUS_CREDENTIAL_ADT_AUDIT_DATA_ID.
	* dbus/dbus-protocol.h: New error
	DBUS_ERROR_ADT_AUDIT_DATA_UNKNOWN.
	* dbus/dbus-sysdeps.c: Support for reading
	audit credentials via ADT API.
	* dbus/dbus-transport.c: New function
	_dbus_transport_get_adt_audit_session_data
	to retrieve credentials.
	* dbus/dbus-transport.h: Export it.