switch to e2 machine types

hack/make-rules/test-e2e-node.sh

@@ -33,7 +33,7 @@ skip=${SKIP-"\[Flaky\]|\[Slow\]|\[Serial\]"}
 # The number of tests that can run in parallel depends on what tests
 # are running and on the size of the node. Too many, and tests will
 # fail due to resource contention. 8 is a reasonable default for a
-# n1-standard-1 node.
+# e2-standard-2 node.
 # Currently, parallelism only affects when REMOTE=true. For local test,
 # ginkgo default parallelism (cores - 1) is used.
 parallelism=${PARALLELISM:-8}