yayayahei

Add gatling 3.3.1, run as uid 1000, gid 1000 (#27)

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At GoCD pipeline, it will run `git clean -dffx` firstly. But perviously gatilng image run as root user, it will cause Error when git clean repo.

tokenmanager.appAccessTokenKey(appID)为固定参数，导致NewClient验证第二次传入的错误appsecret时绕过了服务端请求

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 problem: tokenmanager.appAccessTokenKey(appID)为固定参数，localCache为全局变量，appID对应的缓存不过期时，NewClient(appID,wrongSecret)，导致验证wrongSecret成功 want: tokenmanager.appAccessTokenKey(appID) 加上随机码参数，通过client option传递进来，防止appID token被复用