webui unit tests fail with grunt-contrib-qunit:
```
Testing test/all_tests.html
>> Error: Error: QUnit has already been defined.
>> at exportQUnit (file:///home/test/freeipa/install/ui/js/qunit.js:2475:12)
>> at file:///home/test/freeipa/install/ui/js/qunit.js:2946:3
>> at file:///home/test/freeipa/install/ui/js/qunit.js:5061:2
>> Error: TypeError: Cannot set properties of undefined (setting 'reorder')
>> at <anonymous>:175:24
>> at runFactory (file:///home/test/freeipa/install/ui/js/dojo/dojo.js:1:17157)
>> at execModule (file:///home/test/freeipa/install/ui/js/dojo/dojo.js:1:19541)
>> at file:///home/test/freeipa/install/ui/js/dojo/dojo.js:1:20002
>> at guardCheckComplete (file:///home/test/freeipa/install/ui/js/dojo/dojo.js:1:19707)
>> at checkComplete (file:///home/test/freeipa/install/ui/js/dojo/dojo.js:1:19854)
>> at onLoadCallback (file:///home/test/freeipa/install/ui/js/dojo/dojo.js:1:22296)
>> at HTMLScriptElement.onLoad (file:///home/test/freeipa/install/ui/js/dojo/dojo.js:1:26209)
```
Load `qunit` with `dojo.require` that among other useful things helps
> Preventing loading Dojo packages twice.
dojo.require will simply return if the package is already loaded.
See also https://github.com/gruntjs/grunt-contrib-qunit#loading-qunit-with-amd
Related: https://pagure.io/freeipa/issue/9329
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>
Stanislav Levin
a7e13f9719