Add pkg/harvester components + shell portings - 1

Signed-off-by: Francesco Torchia <francesco.torchia@suse.com>

pkg/harvester/utils/regular.js

@@ -0,0 +1,14 @@
+
+export function isValidMac(value) {
+  return /^[A-Fa-f0-9]{2}(-[A-Fa-f0-9]{2}){5}$|^[A-Fa-f0-9]{2}(:[A-Fa-f0-9]{2}){5}$/.test(value);
+}
+
+/**
+ * RFC 1123
+ * https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#dns-label-names
+ */
+export function isValidDNSLabelName(str) {
+  const reg = /^[a-z0-9]([-a-z0-9]*[a-z0-9])?$/;
+
+  return reg.test(str);
+}