Set h2load thread count

Author: JamesNK

build/grpc-v2-scenarios.yml

@@ -80,9 +80,9 @@ parameters:
   type: object
   default:
     - displayName: "Streams: 1"
-      arguments: --variable streams=1 --variable connections=64 --property streams=1
+      arguments: --variable streams=1 --variable connections=$(h2loadConnectionsCount) --variable threads=$(h2loadConnectionsCount) --property streams=1
     - displayName: "Streams: 70"
-      arguments: --variable streams=70 --variable connections=64 --property streams=70
+      arguments: --variable streams=70 --variable connections=$(h2loadConnectionsCount) --variable threads=$(h2loadConnectionsCount) --property streams=70
 
 steps:
 - ${{ each s in parameters.h2loadscenarios }}: