test_connect_delay: don't listen on public interfaces

Tests should only bind to local interfaces. Change listening address
from '*' to '127.0.0.1'.

Also change instances of 'localhost' to '127.0.0.1' as used in all other
tests in this directory.
test_disconnect_inproc: also change comment to make it non-public
Merge pull request #109 from mrothe/no-public-tests

No public tests