Merge pull request #905 from logoff/develop

Upgrade PaxExam version to 2.3.1
Remove meaningless place-holder in blueprints.
Merge pull request #906 from adrian-rosello/develop

Remove meaningless place-holder in blueprints.
Solve Static Route integration tests bad assert.
Throw ActionException if there are no routes, before checking congestion.
Expect ActionException in tests without ports.