cleanup after config api PR was merged

[nirrozenbaum]

This PR cleans up some leftovers from the big config api PR, like typos, not log errors when we return error (and then it's logged by the caller), and updates to almost all plugins to keep things consistent across the plugins.
still need to take care of:

• DecisionTreeFilter cannot be used by the new config api. issue was opened Current Configuration API doesn't support DecisionTreeFilter #1011
• Prefix Plugin need some more cleanup, the prefix.go file has much more than the plugin itself and it would be better to keep it more organized. deferred to a later PR that will be focused on prefix plugin cleanup and organization.

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[nirrozenbaum]

cc @ahg-g @kfswain

[shmuelk]

To properly configure the DecisionTreeFilter plugin needs some underlying plugin maintenance work.

I have a PR for that. On top of which I have the start of a factory function got the DecisionTreeFilter

[nirrozenbaum]

To properly configure the DecisionTreeFilter plugin needs some underlying plugin maintenance work.

I have a PR for that. On top of which I have the start of a factory function got the DecisionTreeFilter

@shmuelk sounds good. I have opened an issue for this #1011.
would be good if you assign yourself so that others won't start working on this in parallel.

[ahg-g]

Thanks, one nit.

[ahg-g]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, nirrozenbaum

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