Include the os module for some workflow algorithms

The os was available before in the old api when import all, it has passed without
notice.

Now, it has been bassed to those scripts using the os module.

re #7760

Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/JumpFit.py

@@ -3,6 +3,7 @@
 from mantid.kernel import StringListValidator, StringMandatoryValidator
 from mantid.simpleapi import *
 from mantid import config, logger, mtd
+import os
 
 class JumpFit(PythonAlgorithm):
 

Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/QLines.py

@@ -3,6 +3,7 @@
 from mantid.kernel import StringListValidator, StringMandatoryValidator
 from mantid.api import PythonAlgorithm, AlgorithmFactory
 from mantid import config
+import os
 
 class QLines(PythonAlgorithm):
 

Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/Quest.py

@@ -3,6 +3,7 @@
 from mantid.kernel import StringListValidator, StringMandatoryValidator
 from mantid.simpleapi import *
 from mantid import config, logger, mtd
+import os
 
 class Quest(PythonAlgorithm):
 

Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/ResNorm.py

@@ -3,6 +3,7 @@
 from mantid.kernel import StringListValidator, StringMandatoryValidator
 from mantid.simpleapi import *
 from mantid import config, logger, mtd
+import os
 
 class ResNorm(PythonAlgorithm):