Prevent find-file-at-point from pinging what looks like domains
Prevent find-file-at-point from pinging what looks like domains

Previously,

* typing `gf` in domain names (for example google.com) in normal buffers
* typing `<tab>` in domain names in the minibuffer

would start pinging that domain name. This is not really useful, so
disable it.

Fixes #2654.

tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs