[PATCH] make flapping smbcontrol test more informative

[Douglas Bagnall]

One of the recent flapping tests is:

2 UNEXPECTED(error):
samba.tests.blackbox.smbcontrol.samba.tests.blackbox.smbcontrol.SmbcontrolBlockboxTests.test_ping(fl2003dc:local)

This is a canary, I suspect -- the test itself is sound (sort of), and
smbcontrol is working, but in trying to ping every server that should
be pingable, the test finds failed servers before something else does.

The trouble is that it tells us nothing about what went wrong, only
that a ping against a PID failed. These patches make the failure
contain just a tiny clue about what happened.

Douglas
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