Fixing property file overwritting in Jenkins Pipelines

Change-Id: Ic7325da3ed73cb07af01ce67e1f44db3215216c3
diff --git a/TestON/JenkinsFile/Trend_Graph_Generator b/TestON/JenkinsFile/Trend_Graph_Generator
index 2779d9b..77e57c9 100644
--- a/TestON/JenkinsFile/Trend_Graph_Generator
+++ b/TestON/JenkinsFile/Trend_Graph_Generator
@@ -36,7 +36,7 @@
     funcs.additionalInitForSR( params.ONOSbranch )
 }
 def prop = null
-prop = funcs.getProperties()
+prop = funcs.getProperties( "FUNC" )
 
 // get the list of the tests from the parameters.
 def Tests = params.Test