select code for open C file/socket descriptors was crashing in FD_SET
if a QSocketNotifier was created with an invalid descriptor.
Added two autotests to QSocketNotifier, one to check notifiers with
bogus socket descriptors don't crash, the other to check that notifiers
with posix socket descriptors do work. (symbian socket engine doesn't
use them so they are not implicitly tested)
Reviewed-by: mread
Task-Number: QTBUG-18138
(cherry picked from commit 8a9a6afcf02f089f932bc81431ab46a60af32134)
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
