BugLink: http://bugs.launchpad.net/bugs/1752072

Update the config-check script to support a new include directive, that can
be used to override annotations from another file. For instance, with
this change a custom kernel can include the annotation file from
"debian.master/" and override some of it policies.

The directive is only available when using the file format 3, that
extends format 2.

The new directive follows the systax:

	include FILEPATH

Quotes are also accepted:

	include "FILEPATH"

`FILENAME` is always relative to the current annotations file location.
So, assuming a custom kernel, the following directive will include the
annotations file from the generic kernel:

	include "../../debian.master/config/annotations"

To avoid mistakes, any reference to a config in the base annotations
file AFTER the include directive will completely override the references
from the included file.

For instance, the following:

    # FORMAT: 3
    include "../../debian.master/config/annotations"
    CONFIG_X note<some note>

Will cause any line related to CONFIG_X in the included annotations file
to be ignored.

The patch also includes smalls changes to avoid warning due to duplicate
variable declarations.
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>