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.

TESTING.asciidoc

@@ -380,7 +380,6 @@ These are the linux flavors supported, all of which we provide images for
 * oel-6 aka Oracle Enterprise Linux 6
 * oel-7 aka Oracle Enterprise Linux 7
 * sles-12
-* opensuse-42 aka Leap
 
 We're missing the following from the support matrix because there aren't high
 quality boxes available in vagrant atlas:

Vagrantfile

@@ -121,12 +121,6 @@ Vagrant.configure(2) do |config|
       dnf_common config, box
     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'

buildSrc/src/main/groovy/org/elasticsearch/gradle/vagrant/VagrantTestPlugin.groovy

@@ -28,7 +28,6 @@ class VagrantTestPlugin implements Plugin<Project> {
             'fedora-27',
             'oel-6',
             'oel-7',
-            'opensuse-42',
             'sles-12',
             'ubuntu-1404',
             'ubuntu-1604',
@@ -529,7 +528,7 @@ class VagrantTestPlugin implements Plugin<Project> {
                 if (project.extensions.esvagrant.boxes.contains(box)) {
                     // these tests are temporarily disabled for suse boxes while we debug an issue
                     // https://github.com/elastic/elasticsearch/issues/30295
-                    if (box.equals("opensuse-42") == false && box.equals("sles-12") == false) {
+                    if (box.equals("sles-12") == false) {
                         packagingTest.dependsOn(batsPackagingTest)
                     }
                 }
@@ -572,7 +571,7 @@ class VagrantTestPlugin implements Plugin<Project> {
             if (project.extensions.esvagrant.boxes.contains(box)) {
                 // these tests are temporarily disabled for suse boxes while we debug an issue
                 // https://github.com/elastic/elasticsearch/issues/30295
-                if (box.equals("opensuse-42") == false && box.equals("sles-12") == false) {
+                if (box.equals("sles-12") == false) {
                     packagingTest.dependsOn(javaPackagingTest)
                 }
             }