Add kitchen test to verify PMIx shared lib can be found

`pmix_info` is an executable compiled and intalled alongside the PMIx
shared library. Use it to ensure the runtime linker can find the shared
library.

Signed-off-by: Tim Lane <[email protected]>

Author: Tim Lane

recipes/tests.rb

@@ -172,6 +172,9 @@
       execute 'check-slurm-pmix-plugins' do
         command 'ls /opt/slurm/lib/slurm/ | grep pmix'
       end
+      execute 'ensure-pmix-shared-library-can-be-found' do
+        command '/usr/bin/pmix_info'
+      end
     end
   when 'ComputeFleet'
     execute 'ls slurm root' do