SPEC-2703: Fix remaining problems in skiplist

SPEC-2703: Fix remaining problems in skiplist

This patch fix the following problems:
- {{GERRIT_CHANGE_NUMBER}},${{GERRIT_PATCHSET_NUMBER}}: bad substitution
   A copy paste from jenkins commands, but I forgot to remove the double {}

- missing grep -v '\*', removed by ec3e1dc57d7a6a454f9ed1f0210b07b8270a1fbb ("Follow up fix")

- for apps, no dedicated skipdir as asked in SPEC-2703

Change-Id: I8dfdc6ff4d03fc946e0b8ad35f092e217afd685b
Bug-AGL: SPEC-2703:
Signed-off-by: Corentin LABBE <clabbe@baylibre.com>