[xenial] linux-gcp 4.13.0-1011.15 uploaded (ABI bump)

[brad.figg at canonical.com]

A new xenial kernel has been uploaded into proposed. Note the ABI bump. 
The full changelog about all bug fixes contained in this upload can be found at:

https://launchpad.net/ubuntu/xenial/+source/linux-gcp/4.13.0-1011.15

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