Merge lp://qastaging/~fginther/vmbuilder/jenkins_kvm-add-azure-17.10 into lp://qastaging/~ubuntu-on-ec2/vmbuilder/jenkins_kvm

Add an artful version of the Azure suite specific template files,
img-azure-17.10-addin.tmpl. Also touch up the other suite specific template
files still in use to properly indicate the suite name. Also extends the
life of `ubuntu-adj2version` for a few more releases up to `cc`.

Add an artful version of the Azure suite specific template files,
img-azure-17.10-addin.tmpl. Also touch up the other suite specific template
files still in use to properly indicate the suite name. Also extends the
life of `ubuntu-adj2version` for a few more releases up to `cc`.

ubuntu-adj2version examples:

$ ./ubuntu-adj2version trusty
14.04
$ ./ubuntu-adj2version xenial
16.04
$ ./ubuntu-adj2version zesty
17.04
$ ./ubuntu-adj2version artful
17.10
$ ./ubuntu-adj2version breazy
18.04
$ ./ubuntu-adj2version crafty
18.10
$ ./ubuntu-adj2version dreamy
6.04

A test image was built and tests are running here: https://cloud-images-jenkins.canonical.com/view/Azure/job/Azure-Tests/1531/

The BasicAzureTests.test_archive issue has been resolved in the tests that have completed so far. I also manually verified the contents of source.list on an image which now shows "http://azure.archive.ubuntu.com/ubuntu/" and has the correct setting for `ClientAliveInterval` in `/etc/ssh/sshd_config`.