Display the report file in the failure statistics

[victorusu]

Currently, ReFrame doesn't report the report file - if any - in the failure statistics section.

It would be nice ReFrame also emits the command to use the report file - similar to what one has for the individual failed tests - something like

Rerun the failed tests using '.....'

A proposal for the failures statistics is

==============================================================================
FAILURE STATISTICS

Total number of test cases: 5
Total number of failures: 3

Phase         #     Failing test cases
------------- ----- ------------------------------------------------------------
sanity        1     [IPCMagicCheck, PrgEnv-xxx, xxx:xxx]
performance   2     [P2PCPULatencyTest, PrgEnv-xxx, xxx:xxx]
                    [P2PCPULatencyTest, PrgEnv-xxx, xxx:xxx]
------------------------------------------------------------------------------
Rerun the failed tests using '.....'

Log file(s) saved in: '/path/to/reframe.log', '/path/to/reframe.out'