Remove opensuse 42 from vagrant tests (#63759)

Opensuse 42 has not worked in a while. The test image is unmaintained,
and cannot be launched. It was removed from CI packaging test runs, but
still remained in vagrant tests. This commit removes it from vagrant
tests.

.ci/matrix-vagrant-packaging.yml

@@ -14,7 +14,6 @@ OS:
   - fedora-29
   - oel-6
   - oel-7
-  - opensuse-42
   - sles-12
   - ubuntu-1604
   - ubuntu-1804

Vagrantfile

@@ -134,12 +134,6 @@ Vagrant.configure(2) do |config|
       dnf_docker config
     end
   end
-  'opensuse-42'.tap do |box|
-    config.vm.define box, define_opts do |config|
-      config.vm.box = 'elastic/opensuse-42-x86_64'
-      suse_common config, box
-    end
-  end
   'sles-12'.tap do |box|
     config.vm.define box, define_opts do |config|
       config.vm.box = 'elastic/sles-12-x86_64'