travis: show logs of test failures

[grooverdan]

if tests fail may as well see what the logs say.

[knet-ci-bot]

Can one of the admins verify this patch?

[jnpkrn]

Respective Travic CI failure (job 622.1) looks like exactly the instance
#315 aims to fix. I wonder if anything in autotools changed since
I don't remember seeing anything like this before.

[jnpkrn]

Indeed, I've seen actually, as just stated at #315.

Regarding the problem at hand, I'd note that in the past, I remember
that the automake's test-driver based tests were "verbose" (rather
excessively since it was regardless whether any failure occurred)
without any additional effort, which may have changed once these
build tools got updated.

Note that better solution than doing it at the Travis level is to
enable it directly on the automake's side, by passing VERBOSE=1
to any kind of make *check.

Looking at the history, I see I've actually dropped that with
commit 4546106. But at this
point, I frankly don't remember whether it was intentional
(because of said previous verbose default), or accidental
(have I confused VERBOSE=1 with V=1?). Perhaps we should
return that back.

But looking at said CI failure, all tests were actually green
(so VERBOSE=1 would not help, anyway), and then, all of
a sudden, a coredump is present. So it looks to me as if
some assumptions about "signalled process will appear as if
it exited with status >127" is fundamentally broken and
needs to be investigated first before we proceed on this item.

In other word, #315 needs a proper attention first, IMHO.

[jnpkrn]

But looking at said CI failure, all tests were actually green
(so VERBOSE=1 would not help, anyway)

For completeness, this Travis CI job 622.1 [1] proves that the current
diagnostics introduced in this very PR won't help...

[1]
https://travis-ci.org/ClusterLabs/libqb/jobs/418594333
https://api.travis-ci.org/v3/job/418594333/log.txt

[jnpkrn]

Just an aside, current Travis CI run failed because of the residual core files
that #315 aims to solve.

[jnpkrn]

Pushed by hand (didn't trigger autoclose).
Thanks!

[jnpkrn]

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