Refactoring junit logger. Added generation of nested testsuites in junit.xml.

[conf]

General intention:

1. Refactor code operating with junit.xml.
2. Implement nested testsuites so Jenkins won't list all tests on 1 page (which makes page very heavy) but nicely organizes them in groups. http://ci.qa.php.net now uses slightly older version of this patch and it went very well. See this page for example.

What was done:

1. Much duplicated code was refactored into separate functions with junit_ prefix.
2. Generation nested testsuites in junit.xml
3. Some whitespace fixes. If you want to see patch without these changes try this url
   https://github.com/conf/php-src/compare/php:PHP-5.4...conf:run-tests-php-5.4?w=1 (like git diff -w)

[Tyrael]

for the record, I updated the run-tests.php on ci.qa.php.net to use this version, and it seems to work just fine.

[conf]

Anybody from qa team here?

[cataphract]

Since Tyrael was who wrote the junit functionality in the first place and he seems to approve, I've merged this into the official repository. Thanks.

[php-pulls]

Comment on behalf of cataphract at php.net:

Merged as 1e88d00.

[conf]

Thank you!