* bus/driver.c (bus_driver_handle_get_connection_selinux_security_context): Renamed
	from bus_driver_handle_get_connection_unix_security_context.  Update for
	error usage.
	(message_handlers): Update for renames.

	* bus/selinux.c (bus_selinux_allows_send): Handle OOM on
	_dbus_string_init failure correctly.
	(bus_selinux_append_context): Convert SID to context.  Append it
	as a byte array.
	(bus_selinux_shutdown): Handle the case where bus_selinux_full_init
	hasn't been called.

	* bus/selinux.h: Update prototype.

	* dbus/dbus-protocol.h (DBUS_ERROR_SELINUX_SECURITY_CONTEXT_UNKNOWN): Renamed
	from DBUS_ERROR_UNIX_SECURITY_CONTEXT_UNKNOWN.