[PATCH][X/aws][X/gke] include scsi_debug.ko on linux-image package

[Kleber Sacilotto de Souza]

BugLink: https://bugs.launchpad.net/bugs/1707663

The systemd autopkgtest 'storage' testcase needs to load the scsi_debug
module to perform its tests. The testcase is currently failing on the
following custom kernels:

* linux-aws: doesn't ship the scsi_debug module.
* linux-gke: ships the scsi_debug module on the linux-image-extra-*-gke
module, however the package is not installed by autopkgtest since it's
not installed by the linux-image-gke meta-package.

Include the scsi_debug.ko module on the linux-aws and linux-gke 
linux-image package so it would be available for the testcase. The module
is very small (~130KB), it won't be automatically loaded on the
system and it doesn't affect the normal operation when loaded.

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2.13.3