Report number of test failures.

Now it reports number of failures for each submitter and
average number of failures for each configuration.

With the second one you can correlate bad code with environmental
caused (ATI).

Change-Id: Iceed0900d66a52d9388fe5087a99512dbaaff0c0
Merge topic 'cdash_discover' into master

dde49486 Report number of test failures.