testimage.bbclass, lib/oeqa: add headers and comments

Adds some comments to testimage.bbclass and the files it calls,
just to give an ideea of what it does.

(From OE-Core rev: 8bbb7116cf02466dfc59a17dc7bb51287aeea55b)

Signed-off-by: Stefan Stanacar <stefanx.stanacar@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/oetest.py

@@ -1,3 +1,12 @@
+# Copyright (C) 2013 Intel Corporation
+#
+# Released under the MIT license (see COPYING.MIT)
+
+# Main unittest module used by testimage.bbclass
+# This provides the oeRuntimeTest base class which is inherited by all tests in meta/lib/oeqa/runtime.
+
+# It also has some helper functions and it's responsible for actually starting the tests
+
 import os, re, mmap
 import unittest
 import inspect

meta/lib/oeqa/utils/decorators.py

@@ -1,3 +1,11 @@
+# Copyright (C) 2013 Intel Corporation
+#
+# Released under the MIT license (see COPYING.MIT)
+
+# Some custom decorators that can be used by unittests
+# Most useful is skipUnlessPassed which can be used for
+# creating dependecies between two test methods.
+
 from oeqa.oetest import *
 
 class skipIfFailure(object):

meta/lib/oeqa/utils/sshcontrol.py

@@ -1,3 +1,12 @@
+# Copyright (C) 2013 Intel Corporation
+#
+# Released under the MIT license (see COPYING.MIT)
+
+# Provides a class for setting up ssh connections,
+# running commands and copying files to/from a target.
+# It's used by testimage.bbclass and tests in lib/oeqa/runtime.
+
+
 import subprocess
 import time
 import os