Generate qunit/index.html using a template and list of scripts in metadata

[kzar]

Background

The Adblock Plus for Chrome extension features some tests which are run from qunit/index.html. That page includes a bunch of JavaScript files which are contain the tests and supporting code. Currently this list of scripts is hard-coded into the HTML source. We now need the ability to easily adjust the list of scripts that are included.

What to change

Make it so that the page qunit/index.html in the adblockpluschrome repository is generated from a template in the buildtools repository called testIndex.html.tmpl. The list of scripts to include should be taken from the general.testScripts option in the metadata. (For a very similar example see background.html.tmpl in the buildtools repository.)

The list of test scripts will need to be added to adblockpluschrome/metadata.common in the general.testScripts option as a space delimited list. At the same time the buildtools dependency will need to be updated.

All changes made to buildtools dependency of adblockpluschrome:

#3039 - Generate qunit/index.html based on metadata
#3017 - Improve metadata file mapping precedence
#3002 - Add and use getDevEnvPath function
#2968 - Implement multi inheritance for metadata files

Hints for testers

These changes should not affect Chrome, Opera and Safari builds:

#3039 Only changes how the test suite index page is generated.
#3017 Has already been tested on Opera, Chrome, Safari and Firefox to ensure the build was not affected at all.
#3002 Is only related to devenv developer builds.
#2968 Adds a muti inheritance functionality for metadata files that we are not using for Opera, Chrome or Safari builds.

[kzar]

​https://hg.adblockplus.org/buildtools/rev/1f43b1f15886
​https://hg.adblockplus.org/buildtools/rev/df07a6d71978
​https://hg.adblockplus.org/adblockpluschrome/rev/649c6dfe1bd8