Merge ~paelzer/usd-importer:add-ubuntu-desktop-sniff-packages into usd-importer:master

[ChristianEhrhardt]

Hi,
Nish outlined on IRC that manual imports have to be added to the whitelist to not get immediately out of date.
Then OTOH we also likely want to re-import them with the stable snap.

If you agree to merge this I can delete the two trees that I imported with the edge snap and then trigger the re-import on stable. Or if adding to the whitelist + waiting is enough then that will be fine as well.

[ChristianEhrhardt (paelzer)]

Adding Didier as he requested those for the Desktop team.
Sorry Didier for that extra detour of a potential re-import.

[Didier Roche (didrocks)]

No worry! Thanks for keeping up on this! LGTM, without any typo on the gtk3 package ;)

review: Approve

[Server Team CI bot (server-team-bot)]

PASSED: Continuous integration, rev:37b9ef0a89da170df3d7c9e09f95a303355084b8
https://jenkins.ubuntu.com/server/job/git-ubuntu-ci/212/
Executed test runs:
    SUCCESS: Checkout
    SUCCESS: Style Check
    SUCCESS: Unit Tests
    SUCCESS: Integration Tests
    IN_PROGRESS: Declarative: Post Actions

Click here to trigger a rebuild:
https://jenkins.ubuntu.com/server/job/git-ubuntu-ci/212/rebuild

review: Approve (continuous-integration)

[Robie Basak (racb)]

review: Approve

diff --git a/gitubuntu/source-package-whitelist.txt b/gitubuntu/source-package-whitelist.txt
index 61b6f35..d3014c4 100644
--- a/gitubuntu/source-package-whitelist.txt
+++ b/gitubuntu/source-package-whitelist.txt
@@ -873,3 +873,7 @@ zlib
 zope.interface
 # Some packages that Ubuntu Studio care about
 qjackctl
+# Ubuntu Desktop team wanted to start on testing git ubuntu with their community on these three packages
+gnome-shell
+gnome-themes-standard
+gtk+3.0