[#3896cn] Add support for suspending a server and blocking boot when suspended

server/errors.go

@@ -0,0 +1,14 @@
+package server
+
+type suspendedError struct {
+}
+
+func (e *suspendedError) Error() string {
+	return "server is currently in a suspended state"
+}
+
+func IsSuspendedError(err error) bool {
+	_, ok := err.(*suspendedError)
+
+	return ok
+}