API review: move avocado.linux.kernel_build to avocado.utils.kernel_build

And while doing that, also remove avocado.linux for good, since no one else
lives there.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

avocado/linux/__init__.py

-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-#
-# See LICENSE for more details.
-#
-# Copyright: Red Hat Inc. 2013-2014
-# Author: Lucas Meneghel Rodrigues <lmr@redhat.com>

examples/tests/linuxbuild.py

@@ -2,7 +2,7 @@
 
 from avocado import Test
 from avocado import main
-from avocado.linux import kernel_build
+from avocado.utils import kernel_build
 
 
 class LinuxBuildTest(Test):

setup.py

@@ -109,7 +109,6 @@ if __name__ == '__main__':
           packages=['avocado',
                     'avocado.core',
                     'avocado.core.plugins',
-                    'avocado.linux',
                     'avocado.utils',
                     'avocado.core.remote',
                     'avocado.restclient',