Update Redis slave image to new location.

[nrdlngr]

Resurrecting #319
Fixes #321

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[nrdlngr]

/re-test

[nrdlngr]

/check-cla

[nrdlngr]

I signed it.

[nrdlngr]

/assign @idvoretskyi

[nrdlngr]

@idvoretskyi @sebgoa can either of you help move this PR along? The guestbook-go example has been broken for a while now, and this fixes it.

[idvoretskyi]

/lgtm

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: idvoretskyi, nrdlngr

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[idvoretskyi]

@nrdlngr sorry for the delay, missed out from the radar.

Approved now, should be good to go.

[nrdlngr]

Thanks @idvoretskyi!