Split FailureEmailResultReporter

Split FailureEmailResultReporter into InvocationFailureResultReporter
and TestFailureResultReporter and remove FailureEmailResultReporter.
Auditing the config files, most people are only using the reporter for
invocation failures, and this greatly simplifies the code while allowing
inv failures and test failures to be sent to different addresses.

Change-Id: Ie1a38cb2e7601e7dd6dfe9168609a856d4797c00
9 files changed