Mods to get xos-core Helm chart working

Change-Id: Ia39b224413f20124fb54dadc419d286e3f28c5d1
diff --git a/xos-core/templates/coreapi-cert-secret.yaml b/xos-core/templates/coreapi-cert-secret.yaml
index a79c84e..84712e5 100644
--- a/xos-core/templates/coreapi-cert-secret.yaml
+++ b/xos-core/templates/coreapi-cert-secret.yaml
@@ -5,5 +5,5 @@
   namespace: default
 type: kubernetes.io/tls
 data:
-  core_api_cert.pem: {{ .Values.secrets.core_api_cert }}
-  core_api_key.pem: {{ .Values.secrets.core_api_key }}
+  tls.crt: {{ .Values.secrets.core_api_cert }}
+  tls.key: {{ .Values.secrets.core_api_key }}