Cherry pick PR: extends path in __init__.py for SDK correctly (#1531)

[johnugeorge]

PR is cherry picked from master

[terrytangyuan]

Thanks!

/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• sdk/python/OWNERS [johnugeorge,terrytangyuan]

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[coveralls]

Pull Request Test Coverage Report for Build 1917407352

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 11 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.2%) to 36.823%

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Files with Coverage Reduction	New Missed Lines	%
pkg/controller.v1/mpi/mpijob_controller.go	2	75.35%
pkg/controller.v1/pytorch/pytorchjob_controller.go	9	61.65%

Totals
Change from base Build 1752754717:	-0.2%
Covered Lines:	2272
Relevant Lines:	6170

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💛 - Coveralls