[packaging] Lock vagrant to virtualbox

Virtualbox is the default virtualization provier for vagrant but folks
override that from time to time. If they do then the build will fail because
the boxes used by the build don't usually support non-virtualbox providers.

Closes #13217

qa/vagrant/src/dev/ant/vagrant-integration-tests.xml

@@ -68,6 +68,13 @@
         That isn't to say that the updates will always be compatible. Its ok to
         just destroy the boxes if they get busted. -->
       <arg value="--provision"/>
+      <!-- We lock the provider to virtualbox because the Vagrantfile specifies
+        lots of boxes that only work properly in virtualbox. Virtualbox is
+        vagrant's default but its possible to change that default and folks do.
+        But the boxes that we use are unlikely to work properly with other
+        virtualization providers. Thus the lock. -->
+      <arg value="--provider"/>
+      <arg value="virtualbox"/>
     </exec>
   </target>