Fixes neuron_direct test in the Jenkins CI (#487)

* Fixing neuron_direct.py
* Added grep in bash script to make sure that the test passed

Author: iomaganaris

tests/jenkins/run_neuron_direct.sh

@@ -14,15 +14,15 @@ build_dir=$(mktemp -d $(pwd)/build_XXXX)
 cd $build_dir
 
 # build special and special-core
-nrnivmodl ../tests/jenkins/mod
 nrnivmodl-core ../tests/jenkins/mod
+nrnivmodl ../tests/jenkins/mod
 ls -la x86_64
 
 # Unload intel module to avoid issue whith mpirun
 module unload intel
 
 # run test sim with external mechanism
-mpirun -n 1 nrniv -python $WORKSPACE/tests/jenkins/neuron_direct.py -mpi
+mpirun -n 1 ./x86_64/special -python -mpi $WORKSPACE/tests/jenkins/neuron_direct.py | grep "Voltage times and i_membrane_ are same and difference is less than 1e-10"
 
 # remove build directory
 cd -