Add a certificate generator makefile/config

Update XOS core certificates

Change-Id: I1e4cda425704e724b9b494609f2e7777424c1951
diff --git a/scripts/pki/.gitignore b/scripts/pki/.gitignore
new file mode 100644
index 0000000..6ec615a
--- /dev/null
+++ b/scripts/pki/.gitignore
@@ -0,0 +1,5 @@
+*.pem
+*.key
+*.csr
+root_ca
+helm_xos_pki.yaml