autotest (shill): add test for default profile default settings

When creating a default profile, shill should populate some
settings with default values. Because default profile creation
is somewhat subtle, it's possible to break this without realizing
it.

Add an autotest so that we can catch such regressions automatically.

BUG=chromium:238708
TEST=manual
CQ-DEPEND=CL:50481

Manual test
-----------
- run this test on shill at revision b9c3feb: tests FAILS
- run this test on shill at ToT: test PASSES

Change-Id: Ia6902c6a54cafe45e012652d31d96043814ff626
Reviewed-on: https://gerrit.chromium.org/gerrit/50332
Commit-Queue: mukesh agrawal <quiche@chromium.org>
Reviewed-by: mukesh agrawal <quiche@chromium.org>
Tested-by: mukesh agrawal <quiche@chromium.org>
2 files changed