nodejs catalog entry only works with apps that bind to port 3000

[ryanj]

Including an optional "Route" that is hard-coded to 3000 is a risky assumption for a catalog example.

Feel free to close this issue if the default nodejs example is only expected to be used with the --starter repo.

Expected impact of this change:

• No route creation by default. After this change, catalog users will need to run odo url create --port 3000 (or similar) as a separate step before connecting to the default nodejs example. This makes the user-experience one step longer, but it would allow the reference catalog example to be used with applications that do not bind to 3000 by default.
• Users with apps that bind to 8080 can successfully use the default catalog entry for nodejs. If they would like to expose a route, they can do so by running odo url create --port 8080.