Fix typo with network manager service_name

Obviously a typo in I02ab1970578bc53ba26461b533d06d1055c2d88e which
appeared between patch sets 5 and 6. Who was the lame reviewer who
missed it? Oh, that would be me.

Change-Id: Ifb9007d8e5c696ee8fd6ef74bd5bc280e331b8bd