Add Power Policy Test Cases into CtsCarHostTestCases

- DeviceTestUtilBase and PowerPolicyTestUtil classes provide
functionalities to wrap up various adb shell commands.
- PowerPOlicyTestResult, TestResultTable and PowerPolicyTestAnalyzer
provide functionality to analyze and examine the test results from the
device
- PowerPolicyHostTest perform each test case and integrate with CTS.

Bug: 180056977
Test: atest CtsCarHostTestCases
Change-Id: I2d7d548f95e61e3e8228a3329e0f2d169288a27f
4 files changed