test: Don't polute user's known hosts file

If you run ./VERIFY as a local user, it will use that known hosts
file and add all sorts of entries for 10.111.111.X to it.

Closes #554

Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>
- Removed stray t from git log
Ignore .a and .so files, and cockpit-polkit