increase LB timeout for bind operation on GCP

[ronakbanka]

Thanks for submitting an pull request to pcf-pipelines.

To speed up the process of reviewing your pull request please provide us with:

• A short explanation of the proposed change: Increase Load balancer timeout from 30 -> 60 seconds to support bind operation on GCP

• An explanation of the use cases your change solves: Able to bind service which requires backend calls for provisioning credentials on data services

• Expected result after the change: Able to bind cloud sql service on gcp

• Current result before the change: Timeout error from Loadbalancer

• Links to any other associated PRs or issues: https://github.com/GoogleCloudPlatform/gcp-service-broker/issues/199

• [x] I have viewed signed and have submitted the Contributor License Agreement

• [x] I have made this pull request to the master branch

• [x] I have run all the unit tests

[cf-gitbot]

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[JaysonBH]

Looks good to me