Take advertise client urls from configuration

[rafis]

This PR is a

• Feature Implementation
• Bug Fix
• Documentation

What this PR does / why we need it:
Possibly fixes a bug, please review.

Which issue(s) this PR fixes

Fixes #

Please leave this checklist in the PR comment so that maintainers can ensure a good PR.

Merge Checklist:

• New feature
  • Tests
  • Documentation
• SVCat CLI flag
• Server Flag for config
  • Chart changes
  • removing a flag by marking deprecated and hiding to avoid
    breaking the chart release and existing clients who provide a
    flag that will get an error when they try to update

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[k8s-ci-robot]

Hi @rafis. Thanks for your PR.

I'm waiting for a kubernetes-incubator or kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jberkhahn]

/ok-to-test

you need to sign the CLA, though

[jberkhahn]

/test pull-service-catalog-xbuild

[jberkhahn]

/test pull-service-catalog-xbuild

[jberkhahn]

/test pull-service-catalog-xbuild

[jberkhahn]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jberkhahn, rafis

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Needs approval from an approver in each of these files:

• OWNERS [jberkhahn]

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[mszostok]

/test pull-service-catalog-xbuild