Accept multiple values for flux create hr --values-from

[somtochiama]

This pull request updates --values-from flag for flux create helmrelease to accept a comma-separated list of object references.
e.g

flux create hr podinfo  --values-from=Secret/my-secret-values,ConfigMap/my-values

Signed-off-by: Somtochi Onyekwere somtochionyekwere@gmail.com

[stefanprodan]

@somtochiama pflag does know about multi value flags, it knows how to parse the , and also accepts multiple flags. We want --values-from to behave like --value, to do this valuesFrom must be an array set with StringSliceVar. In your implementation, setting multiple -values-from has no effect, the last one overrides all others.

[stefanprodan]

LGTM

Thanks @somtochiama please squash and rebase