Nicer port in use errors

[keorn]

No description provided.

[tomusdrw]

I think I would add something like: make sure that another instance of Parity or geth is not running or specify different port using:

[tomusdrw]

And would be good if there was a similar message for Signer and Network too :)

[keorn]

It is fine to run another Parity instance, it just has to use different resources.

[tomusdrw]

Yes, but it suggests to non tech-savvy users what (may have) caused the problem.

[coveralls]

Coverage decreased (-0.007%) to 86.136% when pulling 4f2f0cd on nicer-port-errors into b6f2628 on master.

[coveralls]

Coverage increased (+0.01%) to 86.153% when pulling c9037be on nicer-port-errors into b6f2628 on master.

[coveralls]

Coverage decreased (-0.007%) to 86.136% when pulling 921b500 on nicer-port-errors into b6f2628 on master.

[coveralls]

Coverage decreased (-0.04%) to 86.106% when pulling 921b500 on nicer-port-errors into b6f2628 on master.