playbooks: Change all the hosts names to FQDN.

We have changed our ansible configuration and policy to only use
fully qualified domain names for hostnames. Update the playbooks
to use them.

playbooks/apollo.yml

 ---
 
 - name: setup apollo
-  hosts: apollo
+  hosts: apollo.archlinux.org
   remote_user: root
   roles:
     - { role: common, tags: ['common'] }

playbooks/orion.yml

 ---
 
 - name: setup orion
-  hosts: orion
+  hosts: orion.archlinux.org
   remote_user: root
   vars:
     archweb_db_host: 'apollo.archlinux.org'

playbooks/soyuz.yml

 ---
 
 - name: setup soyuz
-  hosts: soyuz
+  hosts: soyuz.archlinux.org
   remote_user: root
   roles:
     - { role: common, tags: ['common'] }

playbooks/vostok.yml

 ---
 
 - name: setup vostok
-  hosts: vostok
+  hosts: vostok.archlinux.org
   remote_user: root
   roles:
     - { role: common, tags: ['common'] }