default to proto2, add support for proto4 in integration suite

integration.sh

@@ -47,8 +47,12 @@ function run_tests() {
 	local proto=2
 	if [[ $version == 1.2.* ]]; then
 		proto=1
+	elif [[ $version == 2.0.* ]]; then
+		proto=2
 	elif [[ $version == 2.1.* ]]; then
 		proto=3
+	elif [[ $version == 2.2.* ]]; then
+		proto=4
 	fi
 
 	if [ "$auth" = true ]