Don't kwargs for result_dir in applilcation.py

Signed-off-by: Tomas Hozza <thozza@redhat.com>
remove patches and rebased_patches variables from application.py

Signed-off-by: Tomas Hozza <thozza@redhat.com>
check_build_requires() is now static

Signed-off-by: Tomas Hozza <thozza@redhat.com>
Compare None using 'is' not '=='

Signed-off-by: Tomas Hozza <thozza@redhat.com>