afb-test: use AGL_APP_REVISION as SRCREV

afb-test: use AGL_APP_REVISION as SRCREV

Switch afb-test recipe to using AGL_APP_REVISION as its SRCREV as
all the other binding recipes do.

This change picks up commits:

50911c8 Update autobuild scripts
ac22860 Change skip test verb

Bug-AGL: SPEC-2049, SPEC-3343

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ia148127ed90d900f021023fba99700f97925328e
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/24776
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>