Clean up solution structure (#2493)

Author: Havret

Confluent.Kafka.sln

@@ -673,5 +673,8 @@ Global
 		{6988FB1F-3648-4E5E-821F-55D67CA00FD7} = {9CE4B5F7-9251-4340-BACB-207066A5DBE8}
 		{10CD6000-59A3-40C9-905F-20F4EE03C1B4} = {9CE4B5F7-9251-4340-BACB-207066A5DBE8}
 		{B544BD2C-F46D-4C68-8A31-3010E371E640} = {1EFCD839-0726-4BCE-B745-1E829991B1BC}
+		{85ABD85A-53A2-4222-BE99-CE51F639F623} = {9CE4B5F7-9251-4340-BACB-207066A5DBE8}
+		{493C1E83-B424-488D-B6D6-713D07EF4152} = {9CE4B5F7-9251-4340-BACB-207066A5DBE8}
+		{E72DAB16-FAF7-4365-8151-9450007C93A0} = {9CE4B5F7-9251-4340-BACB-207066A5DBE8}
 	EndGlobalSection
 EndGlobal