Need S3 stress test for discrete graphic

Fix landed here: https://code.launchpad.net/~kissiel/plainbox-provider-checkbox/+git/plainbox-provider-checkbox/+merge/333607

The fix was only fixed dual graphic auto switch, OEM projects need a suspend_30_cycles_with_reboots/logs for dual graphic like

1. Add new “suspend 30 with reboot” template for dual graphics based on /stress/jobs.pxu #68~#83 to /suspend/suspend-graphics.pxu
unit: template
template-resource: graphics_card
template-filter: graphics_card.prime_gpu_offload == 'Off'
id: power-management/{index}_suspend_30_cycles_with_reboots_{product_slug}
plugin: shell
category_id: com.canonical.plainbox::stress
depends:
 power-management/rtc
 suspend/suspend_advanced
 graphics/{index}_auto_switch_card_{product_slug}
requires: ……
flags: noreturn autorestart
user: root
environ: PM_TEST_DRY_RUN
command: …..

2. Add new nested plan for dual graphics into /stress/test-plan.pxu for example
Id: com.canonical.certification::stress-suspend-30-cycles-with-reboots-automated-dual-graphics
unit: test plan
_name: Suspend stress tests (with reboots) for dual graphics
_description: Suspend stress tests (with reboots) for dual graphics
include:
power-management/1_suspend_30_cycles_with_reboots_.*
power-management/1_suspend-30-cycle-log-attach-with-reboots_.*
…...
power-management/2_suspend_30_cycles_with_reboots_.*
power-management/2_suspend-30-cycle-log-attach-with-reboots_.*
….

# reopen this issue based on https://docs.google.com/document/d/1Cj-HMAnY-W1uwoYIgTW36aFz3fIbQzVzjKpLktIt9Is/edit#heading=h.4lu4w12akx1h

Discussion on irc, the effective operations that checkbox should carry out are:

switch to iGPU, reboot, 30 S3, reboot, 30 S3, reboot, 30 S3, attach logs
switch to dGPU, reboot, 30 S3, reboot, 30 S3, reboot, 30 S3, attach logs

Bug was migrated to GitHub: https://github.com/canonical/checkbox/issues/60.
Bug is no more monitored here.