[etcd/tracing]: fix etcd sampling rate flag

[ugur99]

What type of PR is this?
/kind bug

What this PR does / why we need it:
This MR fixes wrong env variable for etcd.

Which issue(s) this PR fixes:

Fixes # none

Special notes for your reviewer:
etcd monitoring document

Does this PR introduce a user-facing change?:

[etcd] fixes wrong distributed tracing flag for etcd 

[k8s-ci-robot]

Hi @ugur99. Thanks for your PR.

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[ugur99]

Hi @mzaian and @yankay! Sorry for tagging you here, but I just realized that I made a typo in one of the etcd tracing flags. This MR fixes the problem. I thought it would be nice if we could merge and include this for the next release.

[mzaian]

Hi @mzaian and @yankay! Sorry for tagging you here, but I just realized that I made a typo in one of the etcd tracing flags. This MR fixes the problem. I thought it would be nice if we could merge and include this for the next release.

Thanks for catching this @ugur99

/ok-to-test

[ugur99]

Hi @mzaian! anything you want me to work on regarding this PR?

[mzaian]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mzaian, ugur99

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