The has_exactly_one_service variable was used in now deleted code. Drop
this part to make code cleaner.
(From OE-Core rev: 8acee5a86efd146186e0de1c41d0e4e4223d8b36)
Signed-off-by: Dmitry Eremin-Solenikov <dmitry_eremin@mentor.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>