Add ability to set multiple namespaces to search for secrets and configMaps

[Krasttt]

Add ability to set multiple namespaces to search for secrets and configMaps.

Add new parameters:

1. -secrets-list-of-namespaces - Kubernetes list of namespaces to search for secrets.
2. -configmaps-list-of-namespaces -> Kubernetes list of namespaces to search for configmaps.

This parameters allow to set list of namespaces to search for secrets/configMaps.
Example,

-secrets-list-of-namespaces="namespace_1,namespace_2,namespace_3"
-configmaps-list-of-namespaces="namespace_1,namespace_2,namespace_3"

Open Issue - #73

[joe-elliott]

I really like this change, but I'd like to keep it backwards compatible by preserving the old CLI params.

Perhaps just concatenate any namespaces specified in both -secrets-namespace and -secrets-namespaces? (and do the same for the configmap params?)

[Krasttt]

I really like this change, but I'd like to keep it backwards compatible by preserving the old CLI params.

Perhaps just concatenate any namespaces specified in both -secrets-namespace and -secrets-namespaces? (and do the same for the configmap params?)

Done.

-secrets-namespace/-configmaps-namespace have marked as DEPRECATED

[joe-elliott]

A couple of small suggestions, but it's looking good.

One weird consequence of this PR is that you can no longer pass an empty string "" to the config map or secret checker. I'm honestly not sure what that does. If it searches all namespaces and its a feature that people relied on we need to make sure that we preserve it.

Maybe if getSanitizedNamespaceList() is about to return an empty slice then it returns a slice with just the empty string instead?

Also I think the StartChecking() methods should log an error, raise a metric and bail if an empty slice is passed in since they won't do anything.

[joe-elliott]

I prefer the old name -secrets-namespaces and -configmaps-namespaces.

[Krasttt]

These names are too similar and can be confused. But if you want, I can return the old names.

[joe-elliott]

This looks great. Thank you!

[danielrozenblum]

Hello
@joe-elliott
Using latest chart and version 2.10 but still didnt get it to work
tried:
-secrets-namespace="namespace_1,namespace_2"
-secrets-namespaces="namespace_1,namespace_2"
-secrets-list-of-namespaces="namespace_1,namespace_2"

but nothing works. it gives results only from the last namesapce I of the list

any fix for that?

Thank you