Turn off SHARP for DALI L2 tests

- due some problems with CI runners turn of SHARP that is not
  needed for the tests

Signed-off-by: Janusz Lisiecki <jlisiecki@nvidia.com>

qa/TL2_FW_iterators_perf/test_pytorch.sh

@@ -9,6 +9,9 @@ do_once() {
 }
 
 test_body() {
+    # turn off SHARP to avoid NCCL errors
+    export NCCL_NVLS_ENABLE=0
+
     for fw in "pytorch"; do
         python test_RN50_data_fw_iterators.py --framework ${fw} --gpus ${NUM_GPUS} -b 13 \
             --workers 3 --prefetch 2 --epochs 3