make USECASE_SdnipI2MN_Cluster.py executable

Change-Id: Ifaf645df6bae050e4226f0b291cf57695b6e2cd6
diff --git a/TestON/tests/USECASE_SdnipFunctionCluster_fsfw/Dependency/USECASE_SdnipI2MN_Cluster.py b/TestON/tests/USECASE_SdnipFunctionCluster_fsfw/Dependency/USECASE_SdnipI2MN_Cluster.py
old mode 100644
new mode 100755