AppVeyor: Properly upload JUnit xml test results

[ralphlange]

AppVeyor can show test results in the UI when they are properly uploaded.
(see https://www.appveyor.com/docs/running-tests/#uploading-xml-test-results)

That should be possible for EPICS test results converted to JUnit XML.

[anjohnson]

Great. Note that to be able to use the tap-to-junit-xml.pl script which make junitfiles runs the Perl installation needs the XML::Generator module which isn't normally present but is easily installed:

C:\Users\anj>perldoc XML::Generator
No documentation found for "XML::Generator".

C:\Users\anj>cpanm install XML::Generator
--> Working on install
Fetching http://www.cpan.org/authors/id/D/DA/DAGOLDEN/install-0.01.tar.gz ... OK

Configuring install-0.01 ... OK
Building and testing install-0.01 ... OK
Successfully installed install-0.01
--> Working on XML::Generator
Fetching http://www.cpan.org/authors/id/B/BH/BHOLZMAN/XML-Generator-1.04.tar.gz ... OK                                                                          
Configuring XML-Generator-1.04 ... OK
Building and testing XML-Generator-1.04 ... OK
Successfully installed XML-Generator-1.04
2 distributions installed