Move all kernel tests using legacy APIs into tests/legacy to continue testing
old APIs and compatibility. We keep in tests/kernel those tests that do not use
any kernel APIs and generic in nature, those should not be affected by the
unified kernel API change.
In tests/kernel we will start adding tests that are unified kernel only. Later
and when deprecation period is over the legacy tests would be dropped.
Change-Id: Icc7d8c7e5f2af65af350b75da3117f72396925f4
Signed-off-by: Anas Nashif <anas.nashif@intel.com>