oeqa/core: Add base OEQA framework

case: Defines OETestCase base class that provides custom
    methods/attrs defined by the framework.
    Every OETestCase instance contains a reference to the test
    data (d), the test context (tc) and the logger.
    Also implements _oe{SetUp,TearDown}Class for make special
    handling of OEQA decorators and validations.

runner: Defines OETestRunner/OETestResult with support for RAW
    and XML result logs.

exception: Custom exceptions related to the OEQA framework based
    on class OEQAException.

[YOCTO #10230]
[YOCTO #10233]

(From OE-Core rev: c466086ccc4d4bb02d578a821cfb945945bfd529)

Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/core/case.py

@@ -0,0 +1,46 @@
+# Copyright (C) 2016 Intel Corporation
+# Released under the MIT license (see COPYING.MIT)
+
+import unittest
+
+from oeqa.core.exception import OEQAMissingVariable
+
+def _validate_td_vars(td, td_vars, type_msg):
+    if td_vars:
+        for v in td_vars:
+            if not v in td:
+                raise OEQAMissingVariable("Test %s need %s variable but"\
+                        " isn't into td" % (type_msg, v))
+
+class OETestCase(unittest.TestCase):
+    # TestContext and Logger instance set by OETestLoader.
+    tc = None
+    logger = None
+
+    # td has all the variables needed by the test cases
+    # is the same across all the test cases.
+    td = None
+
+    # td_vars has the variables needed by a test class
+    # or test case instance, if some var isn't into td a
+    # OEMissingVariable exception is raised
+    td_vars = None
+
+    @classmethod
+    def _oeSetUpClass(clss):
+        _validate_td_vars(clss.td, clss.td_vars, "class")
+        clss.setUpClassMethod()
+
+    @classmethod
+    def _oeTearDownClass(clss):
+        clss.tearDownClassMethod()
+
+    def _oeSetUp(self):
+        for d in self.decorators:
+            d.setUpDecorator()
+        self.setUpMethod()
+
+    def _oeTearDown(self):
+        for d in self.decorators:
+            d.tearDownDecorator()
+        self.tearDownMethod()