Forcibly kill bugreports between test cases.

This will prevent a failure in one test case from cascading into others
and causing flakes. Since only one bugreport can be in progress at once,
a test failing to reach the end of its BR may then cause subsequent test
cases to receive BUGREPORT_ERROR_ANOTHER_REPORT_IN_PROGRESS.

Bug: 179224456
Test: atest CtsCarrierApiTestCases:BugreportManagerTest
Change-Id: I8d730d8b1a0f79c1ee536b47d828aa8274af14be
1 file changed