🌱 KCP: stop recreating logger for etcd client

[sbueringer]

Signed-off-by: Stefan Büringer [email protected]

What this PR does / why we need it:
Noticed during scale tests that clientv3.New was creating a new logger every time it was called. This was responsible for ~ 7% of memory allocations in KCP.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[sbueringer]

/cherry-pick release-1.9

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@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.9 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.9

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