Debian .install files are processed by dh_install, which is not able to
rename files - it always interprets destination as a directory
name. Thus debian package contained
`/usr/sbin/set_rabbitmq_policy/set_rabbitmq_policy.sh` instead of
`/usr/sbin/set_rabbitmq_policy`.
Change-Id: I7ded7d870f1279b5d96028725da76a14015568f5
Closes-Bug: 1589599