Add annotation in CSTest to set flag values before instantiating CS

CSTest SetUp sets flag values based on annotations before
constructing ConnectivityService.
For flags that are loaded at ConnectivityService constructor, tests can
use this annotation to set flag values.

Test: TH
Change-Id: I5a995a3de4e433ac39e6ccc116b9d89da468b04b
2 files changed