Quentin 30/06/2021: add python module load in Belenos configure

src/configure

@@ -175,6 +175,7 @@ export ARMCI_SHR_BUF_METHOD=COPY
                 export NEED_TOOLS=YES
                 export MNHENV=${MNHENV:-"
 module purge
+module load python/3.7.6
 module load intel/2019.5.281
 module load openmpi/intel/4.0.2.2
 module load cmake/3.15.4