autotest (shill): add test for creation of services from default profile

When shill starts up, it should instantiate services from the default
profile. Emulate that scenario, and check that such services are
visible over D-Bus.

BUG=chromium:237588
TEST=manual
CQ-DEPEND=CL:50328

Manual test
-----------
- Run this test against shill at revision 81599e0. Test FAILS.
- Run this test against ToT. Test PASSES.

Change-Id: I67964bd70fe99d0e3c14c1a5ee946412085dac0d
Reviewed-on: https://gerrit.chromium.org/gerrit/50327
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: mukesh agrawal <quiche@chromium.org>
Tested-by: mukesh agrawal <quiche@chromium.org>
2 files changed