[yocto] test cases: Depending on other tests

[Paulo Neves]

Hello all

I have been working with the test functionality of yocto and have
created some testcases in a single python file.

Now I wanted refactor my code and split some of the cases across
smaller unit tests files. I have 2 functionalities required to
achieve this spliting:

* Be able to import a common piece of code
In the cases directory i created a GTestUtills.py and in my case i
import it. I get a syntax error on the import. Both GTestUtils.py and
my_testcase.py are in the cases directory.

* Be able to depend on tests from other cases
When mycase1.py has a testA which depends on a
mycase2.mycaseTest.testB it gives me an error saying that
mycase2.mycaseTest.testB is not available even though it clearly is.
It is not a typo because no options are available at all in the
failures' suggestion.

Interestingly open embedded testcases are available as well as the
mycase1 tests.

Paulo Neves
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