extends path in __init__.py for SDK correctly

[cakeislife100]

What this PR does / why we need it:
Correctly extends path in SDK __init__.py so training-operator does not break other Kubeflow python SDK imports.

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):
Fixes #1471

Checklist:

• Docs included if any changes are user facing

[aws-kf-ci-bot]

Hi @cakeislife100. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[gaocegege]

/ok-to-test

[coveralls]

Pull Request Test Coverage Report for Build 1810714239

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 9 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 36.823%

---

Files with Coverage Reduction	New Missed Lines	%
pkg/controller.v1/pytorch/pytorchjob_controller.go	9	61.65%

Totals
Change from base Build 1755002371:	-0.1%
Covered Lines:	2272
Relevant Lines:	6170

---

💛 - Coveralls

[alembiewski]

Thank you for your contribution, @cakeislife100. LGTM!

[terrytangyuan]

Thanks!

/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cakeislife100, terrytangyuan

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Needs approval from an approver in each of these files:

• sdk/python/OWNERS [terrytangyuan]

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