Update prometheus parameters

[facorazza]

The prometheus parameters have changed since popeye version 0.20.0:

Usage:
  popeye [flags]
  popeye [command]
Available Commands:
  completion  Generate the autocompletion script for the specified shell
  help        Help about any command
  version     Prints version/build info
Flags:
  -A, --all-namespaces                 When present, runs linters for all namespaces
      --as string                      Username to impersonate for the operation
      --as-group stringArray           Group to impersonate for the operation
      --certificate-authority string   Path to a cert file for the certificate authority
  -c, --clear                          Clears the screen before a run
      --client-certificate string      Path to a client certificate file for TLS
      --client-key string              Path to a client key file for TLS
      --cluster string                 The name of the kubeconfig cluster to use
      --cluster-name string            Specify a cluster name when running popeye in cluster
      --context string                 The name of the kubeconfig context to use
  -f, --file string                    Use a spinach YAML configuration file
      --force-exit-zero                Force zero exit status when report errors are present
  -h, --help                           help for popeye
      --insecure-skip-tls-verify       If true, the server's caCertFile will not be checked for validity
      --kubeconfig string              Path to the kubeconfig file to use for CLI requests
  -l, --lint string                    Specify a lint level (ok, info, warn, error) (default "ok")
      --min-score int                  Force non-zero exit if the cluster score is below that threshold (default 50)
  -n, --namespace string               If present, the namespace scope for this CLI request
  -o, --out string                     Specify the output type (standard, jurassic, yaml, json, html, junit, score) (default "standard")
      --output-file string             Specify the file name to persist report to disk
      --over-allocs                    Check for cpu/memory over allocations
      --push-gtwy-password string      Prometheus pushgateway auth password
      --push-gtwy-url string           Prometheus pushgateway address e.g. http://localhost:9091
      --push-gtwy-user string          Prometheus pushgateway auth username
      --request-timeout string         The length of time to wait before giving up on a single server request
      --s3-bucket string               Specify to which S3 bucket you want to save the output file
      --s3-endpoint string             Specify an s3 compatible endpoint when the s3-bucket option is enabled
      --s3-region string               Specify an s3 compatible region when the s3-bucket option is enabled
      --save                           Specify if you want Popeye to persist the output to a file
  -s, --sections strings               Specify which resources to include in the scan ie -s po,svc
      --token string                   Bearer token for authentication to the API server
      --user string                    The name of the kubeconfig user to use

[facorazza]

Could you merge #1086 as well?