Use redis-replica instead of redis-slave in GUI

[srinivaschavan]

With change in the name of services for redis replicas, the php code needs update to point to the right pod. Without the fix the guestbook app is broken.

[linux-foundation-easycla]

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• ✅ Srinivas Chavan (07b0cac)

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[srinivaschavan]

I signed it

[sujith-es]

To temporarily revert the config file from replica to slave. https://gist.github.com/sujith-es/5ddcc12259c9affb46c4c3a7d3bde9c1 verified in AWS EKS.

[srinivaschavan]

@idvoretskyi @sebgoa , could please take a look at this change?

[sebgoa]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sebgoa, srinivaschavan

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