Merge "Revert "Migrate contexts tests to Android.bp"" am: 8bd664ba28 am: b9e7afda53 am: 24c0c93ae6

Original change: https://android-review.googlesource.com/c/platform/system/sepolicy/+/1949061

Change-Id: Ic04faf833a237e8ffcb94770fa5f71a2628b53bf