Java: Refactor Test DataFlow configurations to new API

[egregius313]

Moves test cases under java/ql/test to the new dataflow api.

[atorralba]

I did a cursory review and it LGTM, plus tests passing is a good indication that nothing broke.

Having said that, at least some of the configurations used in query tests (namely Xss[Config|Flow] and QueryInjectionFlow[Config]) could be imported from the corresponding *Query.qll files instead of replicating them in the test. Or are you waiting to finish the *Query.qll refactor to make this change in one go?

[egregius313]

could be imported from the corresponding *Query.qll files instead of replicating them in the test. Or are you waiting to finish the *Query.qll refactor to make this change in one go?

@atorralba I've decided to move the XSS and SpringJDBC queries over, since their configurations are already in lib/. The XPath configuration is still defined in src/, so that one is better handled in the *Query.qll refactor imo.

[atorralba]

Great, thanks!