Improve Troubleshooting section

Complete the onos-diagnostics subsection. Add Pipeline Walkthrough
as subsection of ONOS troubleshooting and fix a couple of wrong
namespace

Change-Id: Id6d58bd1ae587a268a96a43087e3997b677aee12
diff --git a/dict.txt b/dict.txt
index 3b41902..57bcd18 100644
--- a/dict.txt
+++ b/dict.txt
@@ -86,6 +86,7 @@
 ip
 jitter
 json
+Karaf
 keepalives
 lifecycle
 linecard