update openjdk8 version to 8u171-b11-2

[kristianperkins]

Attempting to build this image currently produces the error:

E: Version '8u162-b12-1~14.04' for 'openjdk-8-jdk' was not found

Looks like the ubuntu version of java8 has been updated again. This has happened before in issue #47.

This PR updates the openjdk to the availabile build version stated here: https://launchpad.net/~openjdk-r/+archive/ubuntu/ppa

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[clareliguori]

Merging this in to unblock building this image locally; we'll work on getting this released in CodeBuild.

I took a look at the release notes: This JDK release adds the 3DES cipher to the disabledAlgorithms list. There is a risk that some builds are currently using an endpoint that requires 3DES cipher, for example to pull down libraries from some old site or with an old client. We have seen similar issues before with builds getting SSLExceptions after a JDK update. The workaround for those cases seems acceptable: override the jdk.tls.disabledAlgorithms property in the buildspec.