Use Go's -short flag as a way to avoid running integration tests.

Signed-off-by: Matt Moyer <moyerm@vmware.com>

test/library/skip.go

@@ -0,0 +1,16 @@
+/*
+Copyright 2020 VMware, Inc.
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package library
+
+import "testing"
+
+// SkipUnlessIntegration skips the current test if `-short` has been passed to `go test`.
+func SkipUnlessIntegration(t *testing.T) {
+	t.Helper()
+	if testing.Short() {
+		t.Skip("skipping integration test because of '-short' flag")
+	}
+}