[Snyk] Security upgrade ubuntu from trusty to trusty-20190515

[snyk-bot]

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

Changes included in this PR

• vendor/golang.org/x/net/http2/Dockerfile

We recommend upgrading to ubuntu:trusty-20190515, as this image has only 135 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	714	NULL Pointer Dereference SNYK-UBUNTU1404-OPENSSL-1049144	No Known Exploit
	886	Off-by-one Error SNYK-UBUNTU1404-SUDO-1065770	Mature
	514	Arbitrary Command Injection SNYK-UBUNTU1404-SUDO-406981	No Known Exploit
	686	Improper Handling of Exceptional Conditions SNYK-UBUNTU1404-SUDO-473059	Mature
	536	Out-of-bounds Write SNYK-UBUNTU1404-SUDO-546522	Mature

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[linux-foundation-easycla[bot]]

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[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/178169871

The labels on this github issue will be updated when the story is started.