It looks like our tests are getting bigger to the point that it needs
more PermGen space. Use fork and run with a bigger perm gen size to get
going.

Amends lvotypko’s 33e0df78 to be as careful as bdff4254 + f65da7f9 + 10e9b002 for persistent actions.

Use build parameters in combination filters

Based on the work of Michael Elkin [1].

[1] https://issues.jenkins-ci.org/secure/attachment/20588/0001-tag-1.414-for-parameters-in-multiconfig-filters.patch

Invalid request submission: {json=[Ljava.lang.String;@2c46358e, .crumb=[Ljava.lang.String;@35661457}
Diagnostics added in 21bf5c45.
Failing I think because message.groovy uses f.submit rather than a plain <input type="submit">,
so JSON gets created and then StaplerRequest.getParameter cannot find it.
But if this is the problem then why would it ever work?
Perhaps a timing issue: JavaScript is used to massage the form just prior to submission,
and maybe this only happens sometimes?
Cannot reproduce test failure locally.

changelog entry for JENKINS-17858

[FIXED JENKINS-17858] allow <f:dropdownDescriptorSelector> to be defaulting to an instance

changelog entry for JENKINS-17723