[Buildroot] [WIP] support/testing: add test to verify 'scp' download via BR2_PRIMARY_SITE

[Thomas De Schampheleire]

El mar., 5 feb. 2019 a las 10:46, Thomas De Schampheleire
(<patrickdepinguin at gmail.com>) escribió:
>
> From: Thomas De Schampheleire <thomas.de_schampheleire at nokia.com>
>
> Recently it was found that the scp download infrastructure was broken.
> To avoid future failures, create a test that verifies that the scp command
> receives the expected arguments.
>

Note: this is marked WIP because:

1. it should be rebased when Ricardo's patches to refactor the
testsuite into runtime and build-time tests is merged
2. it relies on the scp fix to be merged

/Thomas