Make etcd-manager log verbosity configurable

[elblivion]

This PR addresses #7946, which I believed was closed in error - the PR referenced as a fix allows the etcd log level to be changed, but etcd-manager has its own klog-based log level which was hardcoded to a quite verbose level in Kops itself, even reducing the log level of etcd you still have to deal with a lot of noise which then has to be filtered out in fluentd or whatever you use to collect/aggregate container logs.

I took #8402 as a guide, please let me know what you think.

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[elblivion]

I signed it

[rdrgmnzs]

Hi @elblivion thanks for the PR! Things look great, I left one comment/NIT once that's taken care of I'll go ahead and approve the PR.

[rdrgmnzs]

Can we rename this to LogLevel to follow the pattern used in other components.

https://github.com/kubernetes/kops/search?q=logLevel

[elblivion]

Sure thing - also, to avoid further confusion it might help to clarify further that this is the etcd-manager log level, not the etcd it manages; any suggestions on that? e.g. a clearer comment (which I saw is put into the CRD), but maybe also in the property name?

[rdrgmnzs]

I think just a comment mentioning this is for etcd-manager would be enough.

[rdrgmnzs]

/ok-to-test

[rdrgmnzs]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elblivion, rdrgmnzs

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[elblivion]

Thanks @rdrgmnzs! Would this be accepted for cherry-picking into 1.19 beta? Or is it too late?