master-qa-6335

https://issues.liferay.com/browse/LIFERAYQA-6335

There were two main changes I made. This is so that we can run tests in the liferay-qa-portal-legacy-ee repository.

1. I added <pathelement path="${imported.classpath}" /> to build-common.xml. I wanted to reuse the "test-cmd" target in build-common, but to do that, I needed to give build-common.xml access to the test classes that are in liferay-qa-portal-legacy-ee. Hashi and I thought that ${imported.classpath} is a good generic name. We're not sure what else to call it, but if you want to rename it that is perfectly fine.

2. I changed "test.basedir.name" to "test.basedir". This is to make test.basedir an absolute path rather than just a directory name so it'd be easy to pass in the base directory for the tests.