Fix build error for int to string conversion (#396)

[pinkavaj]

Fixes build issue

pkg/kfapp/aws/aws.go:564:74: conversion from int to string yields a string of one rune, not a string of digits (did you mean fmt.Sprint(x)?)

Fixed as suggested, sinc the result should be string with the actual port number.

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[kubeflow-bot]

This change is 

[k8s-ci-robot]

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[pinkavaj]

@googlebot I signed it!

[pinkavaj]

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[Jeffwan]

/ok-to-test

[Jeffwan]

@pinkavaj What's your golang version? We didn't see this issue in the past

[pinkavaj]

@pinkavaj What's your golang version? We didn't see this issue in the past

go version go1.15 linux/amd64

[Jeffwan]

I see. That's probably the reason. Seems this is an backward incompatible change after checking golang/go#32479 and prometheus/prometheus#7706

We can make this change for higher go versions. Thanks for contributing!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Jeffwan

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