Ensure LD_PRELOAD exists before running test case
The linker will ignore LD_PRELOAD libraries which do not exist, just printing a warning message. This is not helpful for the test suite which will be utterly fubar without the preload library present. Add an explicit test for existence of the library to protect against this Signed-off-by: NDaniel P. Berrange <berrange@redhat.com> (cherry picked from commit b1d3154a)
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