Reduce AWS Batch tests to avoid Docker hub throttling

Removed one os from `test_efs_same_az` and `test_raid_performance_mode`:

I think we can safely remove one os from this test because the efs and raid recipes don't depend by the OS.
In any case we're already testing all the OSes with the other schedulers.

Signed-off-by: Enrico Usai <[email protected]>

Author: Enrico Usai

tests/integration-tests/configs/common/common.yaml

@@ -382,7 +382,7 @@ storage:
         schedulers: ["slurm"]
       - regions: ["ap-northeast-1", "cn-north-1"]
         instances: {{ common.INSTANCES_DEFAULT_X86 }}
-        oss: {{ common.OSS_BATCH }}
+        oss: ["alinux2"]
         schedulers: ["awsbatch"]
   test_raid.py::test_raid_fault_tolerance_mode:
     dimensions:
@@ -402,7 +402,7 @@ storage:
         schedulers: ["sge"]
       - regions: ["ap-south-1"]
         instances: {{ common.INSTANCES_DEFAULT_X86 }}
-        oss: {{ common.OSS_BATCH }}
+        oss: ["alinux"]
         schedulers: ["awsbatch"]
   test_ebs.py::test_default_ebs:
     dimensions: