Added ability to force mastership re-balancing between instances from the GUI.

Change-Id: I98e56deb3e2b00df630ed85b596c8e35b3d6efab
diff --git a/web/gui/src/main/webapp/onosQuickHelp.js b/web/gui/src/main/webapp/onosQuickHelp.js
index 596276b..9e2a5ec 100644
--- a/web/gui/src/main/webapp/onosQuickHelp.js
+++ b/web/gui/src/main/webapp/onosQuickHelp.js
@@ -55,6 +55,7 @@
         equals: '=',
         dash: '-',
         slash: '/',
+        backQuote: '`',
         leftArrow: 'L-arrow',
         upArrow: 'U-arrow',
         rightArrow: 'R-arrow',