Remove a spurious import in test_antlr_builder.
Review Request #1951 - Created March 19, 2015 and submitted
The import was supposed to come after the generated code imports, to 'prove' that namespace packaging works. However isort moved it to the wrong place for that, and in any case the builder now verifies that namespace packages are indeed functional as such, so this 'test' is not needed. This test is deeply flawed anyway. All it tests is that it can import the generated code from its dependencies, so, for example, it can't detect a break in the code generation until you clean and regenerate. Just rerunning the test isn't enough. Hopefully we'll soon rewrite antlr/thrift python generation uniformly with the JVM side, and we can get rid of these tests entirely.
Ran that test.
Also verified that the test didn't work before anyway.