Add auth token flags for pulsar-perf

[wolfstudy]

Signed-off-by: xiaolongran rxl@apache.org

Motivation

Add token/JWT and trusted certificate support in Pulsar perf go client. So that it can be used in production environment.

Modifications

Implement pulsar-perf-go command-line arguments for token-file, token-string and trusted-cert-file. These three arguments are optional. There is no change to the default non-TLS and no auth configuration.

How to use

$ cd perf
$ go build .
$ ./perf

Output as follows:

      --token-file string        file path to the Pulsar JWT file
      --token-string string      string to the Pulsar JWT
      --trust-cert-file string   file path to the trusted certificate file

[wolfstudy]

And the style check seems that it has nothing to do with this change. If necessary, we can fix this problem in the next pull request. Have we followed the golangci-lint specification before?