deb: Dont include /usr in package

The `/usr` directory contains only two files:

```
/usr
/usr/lib
/usr/lib/tmpfiles.d
/usr/lib/tmpfiles.d/puppetserver.conf
/usr/share
/usr/share/doc
/usr/share/doc/openvox-server
/usr/share/doc/openvox-server/changelog.gz
```

We don't package
/usr/lib/tmpfiles.d/*.conf anymore. And the changelog.gz is
autogenerated by fpm afterwards. That means that in our packaging
directory, there is no `/usr`. If we force fpm to package it, it will
raise an error.

Signed-off-by: Tim Meusel <tim@bastelfreak.de>
(cherry picked from commit eccc37d)
Signed-off-by: Tim Meusel <tim@bastelfreak.de>

Author: bastelfreak

resources/puppetlabs/lein-ezbake/template/global/ext/fpm.rb

@@ -134,7 +134,7 @@
                     when :amazon, :fedora, :sles, :el, :redhatfips
                       ['etc', 'opt', 'usr', 'var']
                     when :debian, :ubuntu
-                      ['etc', 'lib', 'opt', 'usr', 'var']
+                      ['etc', 'lib', 'opt', 'var']
                     else
                       fail "I don't know what your default sources should be, pass it on the command line!"
                     end