Refactored LogcatHelper and tests that uses it.

Also fixed wrong assertion on testWriteCarUserManagerLogoutUserReq

Bug: 223670638
Bug: 223642864

Test: atest CtsCarBuiltinApiTestCases:SlogfTest CtsCarBuiltinApiTestCases:TimeUtilsTest CtsCarBuiltinApiTestCases:TimingsTraceLogTest EventLogHelperTest

Change-Id: I09b03d7957fee2776d64c8e531067ca83108f8b8
5 files changed