Add CI for 16x ubuntu servers (#6040)

.gitlab-ci/vagrant.yml

 ---
 
 molecule_tests:
-  tags: [vagrant]
+  tags: [c3.small.x86]
   only: [/^pr-.*$/]
   except: ['triggers']
   image: quay.io/kubespray/vagrant:$KUBESPRAY_VERSION
@@ -22,7 +22,8 @@ molecule_tests:
     CI_PLATFORM: "vagrant"
     SSH_USER: "kubespray"
     VAGRANT_DEFAULT_PROVIDER: "libvirt"
-  tags: [vagrant]
+    KUBESPRAY_VAGRANT_CONFIG: tests/files/${CI_JOB_NAME}.rb
+  tags: [c3.small.x86]
   only: [/^pr-.*$/]
   except: ['triggers']
   image: quay.io/kubespray/vagrant:$KUBESPRAY_VERSION
@@ -40,4 +41,9 @@ molecule_tests:
 vagrant_ubuntu18-flannel:
   stage: deploy-part2
   extends: .vagrant
-  when: on_success
\ No newline at end of file
+  when: on_success
+
+vagrant_ubuntu18-weave-medium:
+  stage: deploy-part2
+  extends: .vagrant
+  when: manual
\ No newline at end of file

Vagrantfile

@@ -7,7 +7,7 @@ require 'fileutils'
 
 Vagrant.require_version ">= 2.0.0"
 
-CONFIG = File.join(File.dirname(__FILE__), "vagrant/config.rb")
+CONFIG = File.join(File.dirname(__FILE__), ENV['KUBESPRAY_VAGRANT_CONFIG'] || 'vagrant/config.rb')
 
 COREOS_URL_TEMPLATE = "https://storage.googleapis.com/%s.release.core-os.net/amd64-usr/current/coreos_production_vagrant.json"
 FLATCAR_URL_TEMPLATE = "https://%s.release.flatcar-linux.net/amd64-usr/current/flatcar_production_vagrant.json"

tests/files/vagrant_ubuntu18-weave-medium.rb

+$num_instances = 16
+$vm_memory ||= 1600
+$os = "ubuntu1804"
+$network_plugin = "weave"
+$kube_master_instances = 1
+$etcd_instances = 1

tests/scripts/vagrant_clean.sh

@@ -3,6 +3,8 @@ set -euxo pipefail
 
 # Cleanup vagrant VMs to avoid name conflicts
 
+apt-get install -y libvirt-clients
+
 for i in $(virsh list --name)
 do
     virsh destroy "$i"