toaster: update database schema

This is a schema update to account for

* relaxing constraints in Target_Image_File table
* modifying permission filed to string value
* adding license_manifest_path field
* adding image_size field

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
toaster: write files-in-image to the database

Adding code to write files-in-image data from the metadata
event to the database.

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
toaster: add commands to list and delete builds

We add Django commands for the manage.py to manage the database
content.

The two commands added are:
* buildslist - produces a list of current builds
* builddelete - deletes a build and all associated data from the database

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
toaster: erase checks for stop command

We remove the checks for the stop command, since we assume
the user really means it wants to shutdown the system when
he issues the command.

	[YOCTO #5376]

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
toaster: Fix help text for task details outcome

Changes made to models.py and task.html to make sure the
help text for the task outcome is displayed.

[YOCTO #5917]

Signed-off-by: Belen Barros Pena <belen.barros.pena@intel.com>
toaster: add empty outcome support to task page

Add the new "empty" outcome value to the task detail page,
with help text, help notice, plus sorting for empty in the
tasks page.

[YOCTO #5917]

Signed-off-by: David Reyna <David.Reyna@windriver.com>
toaster: add 'bblayers.conf' files to local config filter

In the variables table, add to the local configuration
filter the 'bblayers.conf' in addition to the 'local.conf'
files.

[YOCTO #5912]

Signed-off-by: David Reyna <David.Reyna@windriver.com>
toaster: fix 'show all' labels for tasks and variables

Fix the 'Show all' button label to indicate 'variables' and 'tasks'
instead of the internal page label for the variables page and the
Disk I/O, CPU Usage, and Time pages.

[YOCTO #5915]

Signed-off-by: David Reyna <David.Reyna@windriver.com>