Try to write Troubleshooting documenty
More items
Add more into Troubleshooting.md
Merge @akry's review.

https://github.com/axsh/openvnet/pull/272#issuecomment-60073320
Add more examples of command line
Merge pull request #272 from axsh/doc-troubleshooting

Add Troubleshooting.md
Merge branch 'master' into fix-vnet-plugin-find-gw-interface