URLEncode instead of base64 encode the filter string

[neuromage]

This change is 

[neuromage]

/assign @rileyjbauer
/cc @yebrahim
/cc @Ark-kun

[yebrahim]

Why is this better?

[neuromage]

@yebrahim for some context, we discussed base64 vs urlencoding with @Ark-kun and @rileyjbauer yesterday and decided to switch here, mainly due to:

• @rileyjbauer points out it's slightly easier when debugging to parse the string
• @Ark-kun points out that it's probably what most http client libraries do when given a map of key value pairs and asked to construct a url query from them

[rileyjbauer]

/lgtm

[yebrahim]

I see, sgtm then.

[neuromage]

/assign @IronPan for approval

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[IronPan]

/lgtm
/approve

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: IronPan

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[IronPan]

Thanks @neuromage
@yebrahim url encoding is good for cases that human readable adds benefits which this case does.