Move all Dockerfile samples to non-root user

Expected Behaviour

As an OpenFaaS end-user, I want to run all samples on my OpenFaaS cluster, even with the new non-root feature enabled.

Current Behaviour

$ minishift status
Minishift:  Running
Profile:    minishift
OpenShift:  Stopped
DiskUsage:  ERR of

perhaps this is related to the error state from the OpenShift isRunning check

The problem faced currently?

Sometimes it is necessary to block internet egress in services. While istio supports doing this, we don't. We should add support for this.

How can we solve it?

The sidecar config for istio already supports restricting egress as shown here: https://istio.io/latest/docs/reference/config/networking/sidecar/#OutboundTrafficPolicy-Mode. Currently we set it as `AL

1、当没有API文档时的空数据提示
2、当没有搜索到API文档时的空数据提示