test: do not run "v2store" tests

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>

test

@@ -188,10 +188,7 @@ function integration_pass {
 }
 
 function integration_extra {
-	go test -timeout 1m -v ${RACE} -cpu "${TEST_CPUS}" "$@" "${REPO_PATH}/client/integration"
 	go test -timeout 25m -v ${RACE} -cpu "${TEST_CPUS}" "$@" "${REPO_PATH}/clientv3/integration"
-	go test -timeout 1m -v -cpu "${TEST_CPUS}" "$@" "${REPO_PATH}/contrib/raftexample"
-	go test -timeout 5m -v ${RACE} -tags v2v3 "$@" "${REPO_PATH}/etcdserver/api/v2store"
 	go test -timeout 1m -v ${RACE} -cpu "${TEST_CPUS}" -run=Example "$@" "${TEST[@]}"
 }