Remove highvolume tests
Remove highvolume tests

This was causing my auto test running to slow down.  Will add a playlist
soon.

martijnhoekstra/kafka-net,PKRoma/kafka-net,nightkid1027/kafka-net,bridgewell/kafka-net,BDeus/KafkaNetClient,gigya/KafkaNetClient,Jroland/kafka-net,EranOfer/KafkaNetClient,aNutForAJarOfTuna/kafka-net,CenturyLinkCloud/kafka-net,geffzhang/kafka-net