[ONOS-7340]: Add 'Last Updated' Date to All TestON Result Wiki Graphs

Change-Id: I73f49a8b9a8c1e255aab7ac74d017b3b74bd29eb
diff --git a/TestON/JenkinsFile/scripts/SCPFportLat.R b/TestON/JenkinsFile/scripts/SCPFportLat.R
index 4637072..3398b0b 100644
--- a/TestON/JenkinsFile/scripts/SCPFportLat.R
+++ b/TestON/JenkinsFile/scripts/SCPFportLat.R
@@ -250,7 +250,10 @@
                 legend.position="bottom",
                 legend.text=element_text( size=22 ),
                 legend.title = element_blank(),
-                legend.key.size = unit( 1.5, 'lines' ) )
+                legend.key.size = unit( 1.5, 'lines' ),
+                plot.subtitle = element_text( size=16, hjust=1.0 ) )
+
+subtitle <- paste( "Last Updated: ", format( Sys.time(), format = "%b %d, %Y at %I:%M %p %Z" ), sep="" )
 
 colors <- scale_fill_manual( values=c( "#F77670",
                                        "#619DFA",
@@ -274,7 +277,7 @@
 
 print( "Generating fundamental graph data (Port Up Latency)." )
 
-title <- ggtitle( "Port Up Latency" )
+title <- labs( title = "Port Up Latency", subtitle = subtitle )
 
 fundamentalGraphData <- mainPlot +
                         xScaleConfig +
@@ -348,7 +351,7 @@
 
 print( "Generating fundamental graph data (Port Down Latency)." )
 
-title <- ggtitle( "Port Down Latency" )
+title <- labs( title = "Port Down Latency", subtitle = subtitle )
 
 fundamentalGraphData <- mainPlot +
                         xScaleConfig +