Fix tests to work on Docker 1.10
Fix tests to work on Docker 1.10

If we use the `-t` flag, the steps where we run `grep '...'` hang
(unless we kill the container). Removing tty mode (which we don't need
here anyway) ensures they complete properly.

fancyremarker/docker-postgresql,aptible/docker-postgresql,fancyremarker/docker-postgresql,fancyremarker/docker-postgresql,aptible/docker-postgresql,seanknox/docker-postgresql,aptible/docker-postgresql,seanknox/docker-postgresql