Description of problem:
As apb tools help description, it supports helm type registry,
  -t, --type string          registry type (dockerhub, local_openshift, helm) (default "dockerhub")

but when adding helm registry, apb registry do not flag '--runner'

# apb registry add helm --type helm --url "https://kubernetes-charts.storage.googleapis.com" --runner:"docker.io/automationbroker/helm-runner:latest"  --whitelist  '.*apb$'
....
ERRO unknown flag: --runner:docker.io/automationbroker/helm-runner:latest 

Version-Release number of selected component (if applicable):
# apb version
apb-1.9.0


How reproducible:
always

Steps to Reproduce:
1. Follow guid in doc : 
https://github.com/openshift/ansible-service-broker/blob/master/docs/config.md#helm-chart-repository
add registry to apb: 

# apb registry add helm --type helm --url "https://kubernetes-charts.storage.googleapis.com" --runner:"docker.io/automationbroker/helm-runner:latest"  --whitelist  '.*apb$'

2.
3.

Actual results:
command failed with: 
Error: unknown flag: --runner:docker.io/automationbroker/helm-runner:latest
Usage:
  apb registry add <registry_name> [flags]

Flags:
  -h, --help                 help for add
      --namespaces strings   namespaces for 'local_openshift' adapter to search  (e.g. 'openshift,my-project')
      --org string           organization for 'dockerhub' adapter to search (e.g. 'ansible-playbook-bundle')
  -t, --type string          registry type (dockerhub, local_openshift, helm) (default "dockerhub")
      --url string           URL (e.g. docker.io)
      --whitelist strings    regexes for filtering registry contents (e.g. '.*apb$,.*bundle$')

Global Flags:
      --config string   configuration file (default is $HOME/.apb)
  -v, --verbose         verbose output

ERRO unknown flag: --runner:docker.io/automationbroker/helm-runner:latest 

Expected results:
1. remove the support registry type helm in help if don't plan to support it.
   or
2. support '--runner' for this kind of registry 

Additional info: