Double load balancer timeout from 5 mins to 10

[wongma7]

What type of PR is this?
/kind flake

What this PR does / why we need it:
This test sometimes times out at 5 mins, especially in aws china. We just have to wait longer for the load balancer to be ready.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[nckturner]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nckturner, wongma7

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