Ambassador-09-prefix正则表达式

设置 prefix_regex: true，即prefix就可以设置成正则表达式

---
apiVersion: getambassador.io/v2
kind:  Mapping
metadata:
  name:  qotm
spec:
  prefix: "/(v1|v2)/qotm/.*"
  prefix_regex: true
  service: qotm