Localhost resolves to 127.0.1.1 instead of 127.0.0.1 on bionic

/etc/hosts has the following entries:

127.0.1.1 localhost localhost ip4-loopback 
127.0.0.1 localhost nettuno travis vagrant travis-job-xxxx

This means that localhost is always resolved to 127.0.1.1 instead of 127.0.0.1.

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