Adds SDK-target specific networking tests.

Adds a test verifying that apps targeting <= SDK 29
have access to the MAC address of ethernet interfaces.

Adds SELinux tests for apps targeting SDK 29.

Bug: 141455849
Change-Id: I9b9ba084dd1c58d01b97f807d7e0122f059c5121
Fix: 149544376
Test: atest CtsSelinuxTargetSdk27TestCases
Test: atest CtsSelinuxTargetSdk28TestCases
Test: atest CtsSelinuxTargetSdk29TestCases
Test: atest CtsSelinuxTargetSdkCurrentTestCases
13 files changed