oeqa/runtime/cases: Improve test dependency information

Add the OEHasPackage decorator to a variety of tests so they determine
automatically if they should run against a given image.

To ensure tests can do this we need to move target operations such
as scp commands into the tests and out of the class startup/teardown.

(From OE-Core rev: 60d6580b85714b8960a964e775d76a7f937f5e5a)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/runtime/cases/python.py

@@ -1,16 +1,12 @@
 from oeqa.runtime.case import OERuntimeTestCase
 from oeqa.core.decorator.depends import OETestDepends
 from oeqa.core.decorator.oeid import OETestID
+from oeqa.runtime.decorator.package import OEHasPackage
 
 class PythonTest(OERuntimeTestCase):
-    @classmethod
-    def setUpClass(cls):
-        import unittest
-        if "python3-core" not in cls.tc.image_packages:
-            raise unittest.SkipTest("Python3 not on target")
-
     @OETestID(965)
     @OETestDepends(['ssh.SSHTest.test_ssh'])
+    @OEHasPackage(['python3-core'])
     def test_python3(self):
         cmd = "python3 -c \"import codecs; print(codecs.encode('Uryyb, jbeyq', 'rot13'))\""
         status, output = self.target.run(cmd)