Update kitchen-ansible, remove separate debian install

Due to the new kitchen-ansible version it is now
possible to install ansible on all major OS's via a
ansible omnibus script which is provided by
kitchen ansible. There's no more need to separate
the debian tests.

Also removed whitespace.

roles/ansible-ssh-hardening/templates/opensshd.conf.j2

@@ -134,7 +134,7 @@ IgnoreUserKnownHosts yes
 HostbasedAuthentication no
 
 # Enable PAM to enforce system wide rules
-UsePAM {{ 'yes' if ssh_use_pam else 'no' }} 
+UsePAM {{ 'yes' if ssh_use_pam else 'no' }}
 
 # Disable password-based authentication, it can allow for potentially easier brute-force attacks.
 PasswordAuthentication no