Merge pull request #2300 from vkarak/test/fix-numpy-test

[test] Fix setting of environment variables in the numpy test

Author: Vasileios Karakasis

cscs-checks/apps/python/numpy_check.py

@@ -37,8 +37,8 @@ class cscs_numpy_test(numpy_ops_check):
     @run_after('setup')
     def set_num_cpus_per_task(self):
         self.num_cpus_per_task = self.current_partition.processor.num_cores
-        variables = {
-            'OMP_NUM_THREADS': self.num_cpus_per_task
+        self.variables = {
+            'OMP_NUM_THREADS': str(self.num_cpus_per_task)
         }
 
     @run_before('performance')