add environment variable to parallel_regression.py

Author: CatarinaGarbacz

TestCases/parallel_regression.py

@@ -28,9 +28,12 @@
 # make print(*args) function available in PY2.6+, does'nt work on PY < 2.6
 from __future__ import print_function
 
+import os
 import sys
 from TestCase import TestCase
 
+os.environ['LD_LIBRARY_PATH'] = os.getenv('SU2_HOME') + '/build/subprojects/Mutationpp'
+
 def main():
     '''This program runs SU2 and ensures that the output matches specified values.
        This will be used to do checks when code is pushed to github