Add java12 template

[alexellis]

Signed-off-by: Alex Ellis alexellis2@gmail.com

Description

The OpenJDK now ships on Oracle Linux 7 with a different EULA and terms. These have been mentioned in ther welcome message for unsuspecting users.

Dockerfile needed to change to accomodate the different command line commands on Oracle Linux vs Alpine Linux. The size has also increased due to no "light-weight" runtime image being found or provided at the time.

VM options had to change to -XX:+UseContainerSupport from the old flags.

Tested on Docker Swarm.

Motivation and Context

• [x] I have raised an issue to propose this change (required)

Which issue(s) this PR fixes

Fixes #146

How Has This Been Tested?

Tested with simple hello world

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Version change (see: Impact to existing users)

Impact to existing users

New template, new image, with new Linux base image and EULA. This is printed to users when they run faas-cli new

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I've read the CONTRIBUTION guide
• [x] I have signed-off my commits with git commit -s

[alexellis]

Thanks for approving @affix

Next step is to get the libraries used in the Java templates published to a central place, so we can pull them in as a JAR.

[kameshchauhan]

@alexellis I would avoid commenting about use of java8 in the few files separately. But in general, there is a need to rectify the use from java8 to java12...mostly in the /bin/*.

[alexellis]

The bin folder should be removed.. my mistake