graphics_card_resource puts spaces in product names which results in broken job ids

Picture a job like:

unit: template
template-unit: job
template-resource: graphics_card_resource
plugin: shell
id: graphics/{index}_screen-capture-internal_{product}
_summary: Obtains a simple screen capture of {product}
estimated_duration: 1.0
requires: package.name == 'gnome-screenshot'
command: gnome-screenshot --file $PLAINBOX_SESSION_SHARE/screen-capture-{index}.png
_description: Obtains a simple screen capture of {product} using gnome-screenshot if present

Now picture output of graphics_card_resource like:

bus: pci
category: VIDEO
driver: i915
index: 1
path: /devices/pci0000:00/0000:00:02.0
product: Haswell-ULT Integrated Graphics Controller
product_id: 2582
subproduct_id: 1546
subvendor_id: 4136
vendor: Intel Corporation
vendor_id: 32902

The product has spaces, so it results in a job id like:

graphics/1_screen-capture-internal_Haswell-ULT Integrated Graphics Controller

This obviously breaks things resulting in errors similar to (in this case, the bogus job was specified as a dependency):

There were some problems with the selected jobs
 * missing dependency: '2013.com.canonical.certification::Integrated' (direct)
Problematic jobs will not be considered

Previously this was handled in the job's ID which in non-template jobs is done like so:

id: graphics/`echo ${index}`_resolution-change_`echo "${product}" | sed 's/ /_/g;s/[^_a-zA-Z0-9-]//g'`

Since we no longer have that shell processing, maybe the resource should do these substitutions. Though I wonder if munging the product name that much would cause other repercussions. Graphics_card_resource is only ever used in conjunction with that sed substitution, so perhaps it would be OK for the resource itself to do it.