include the connection URI in the no-client output

[afeld]

Builds on #44 - diff. Closes #35.

$ cf connect-to-service -no-client myapp mydb
Finding the service instance details...
Setting up SSH tunnel...
SSH tunnel created.
Skipping call to client CLI. Connection information:

Host: localhost
Port: 52929
Username: myuser
Password: mypass
Name: mydb

To connect:

	PGPASSWORD=mypass psql -h localhost -p 52929 mydb myuser

Connection URI:

	postgresql://myuser:mypass@localhost:52929/mydb

Leave this terminal open while you want to use the SSH tunnel. Press Control-C to stop.

/cc @harrisj