CoreTestRunner: Use AJUR's InstrumentationResultPrinter

The CoreTestRunner has its own StatusUpdateRunListener which
tried to do the same jobs as AndroidJUnitRunner's
InstrumentationResultPrinter class but did not handle ignored
tests. Rather than try and add support for ignored tests to
StatusUpdateRunListener this simply switches CoreTestRunner
to use InstrumentationResultPrinter to ensure consistent
behavior with AndroidJUnitRunner.

Bug: 28224003
Change-Id: I7d43e616a531f7e01892fa073dbddd977bbf4e41
2 files changed