Misleading "Running on..." message

[ygravrand]

Long story short

The console message output by web:run_app is misleading when one binds on 0.0.0.0 (the default): it says 127.0.0.1, so one can think it's listening on local interface only.
I can provide a simple PR modifying the aiohttp/web.py:312 line.
Also, maybe it would be good practise to make the default 127.0.0.1?

Expected behaviour

======== Running on http://0.0.0.0:8000/ ========
(Press CTRL+C to quit)

Actual behaviour

======== Running on http://127.0.0.1:8000/ ========
(Press CTRL+C to quit)

Steps to reproduce

Simply call web.run_app as in the examples

[asvetlov]

Fixed by a1f39a9
Thanks

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