Upgrade HtmlUnit from 2.x to 3.x

[timja-bot]

This is an autogenerated PR for updating HtmlUnit

It follows the migration guide

Migration steps for cases the script can't handle

This migration currently can't handle HtmlOption changes properly.
If it fails to compile on HtmlOption then revert the specific case:

--- a/src/test/java/hudson/plugins/emailext/ExtendedEmailPublisherDescriptorTest.java
+++ b/src/test/java/hudson/plugins/emailext/ExtendedEmailPublisherDescriptorTest.java
@@ -114,7 +114,7 @@ public class ExtendedEmailPublisherDescriptorTest {
      assertEquals(
              "Plain text should be selected by default",
              "text/plain",
-                contentType.getSelectedOptions().get(0).getValue());
+                contentType.getSelectedOptions().get(0).getValueAttribute());

Ping @timja if any questions

script source

[AppVeyorBot]

❌ Build hpe-application-automation-tools-plugin latest.1207-mkuvnkte failed (commit f2bf9765a9 by @timja)

[AppVeyorBot]

❌ Build hpe-application-automation-tools-plugin latest.1207-vcrbldva failed (commit 75f675d105 by @timja)

[codeclimate]

Code Climate has analyzed commit 77e76a0 and detected 0 issues on this pull request.

View more on Code Climate.

[AppVeyorBot]

❌ Build hpe-application-automation-tools-plugin latest.1207-tyydorir failed (commit 2e6ffd8809 by @timja)