common: remove mlocate from all boxes except build

Bash histories indicate this isn't being used anywhere other than
{build,gemini}.archlinux.org and gemini's filelist is so big that
locate becomes so slow that it's practically useless on this box.

playbooks/build.archlinux.org.yml

@@ -5,7 +5,7 @@
   remote_user: root
   roles:
     - { role: common }
-    - { role: tools, extra_utils: ['setconf'] }
+    - { role: tools, extra_utils: ['setconf', 'mlocate'] }
     - { role: sshd }
     - { role: root_ssh }
     - { role: archusers }

roles/common/tasks/main.yml

@@ -46,12 +46,6 @@
     - item.fstype == 'btrfs'
     - not 'backup' in item.mount
 
-- name: install mlocate
-  pacman: name=mlocate state=present
-
-- name: activate regular updatedb for mlocate
-  service: name=updatedb.timer enabled=yes state=started
-
 - name: generate locales
   locale_gen: name={{ item }} state=present
   with_items: