[Snyk] Security upgrade ubuntu from trusty to trusty-20190425

[LeeTsen]

Snyk has created this PR to fix 5 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• vertical-pod-autoscaler/vendor/golang.org/x/net/http2/Dockerfile

We recommend upgrading to ubuntu:trusty-20190425, as this image has only 356 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Off-by-one Error SNYK-UBUNTU1404-SUDO-1065770	829
	Improper Privilege Management SNYK-UBUNTU1404-SUDO-3234995	686
	Improper Handling of Exceptional Conditions SNYK-UBUNTU1404-SUDO-473059	686
	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-UBUNTU1404-OPENSSL-2426359	614
	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-UBUNTU1404-OPENSSL-3314800	614

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Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Improper Privilege Management
🦉 Access of Resource Using Incompatible Type ('Type Confusion')