Remove sgp.mirror.pkgbuild.com

sgp.mirror.pkgbuild.com died, so remove it from the load balancer and
archusers.

group_vars/all/archusers.yml

@@ -227,7 +227,6 @@ arch_users:
       - name: foutrelis_buildhost.pub
         hosts:
           - dragon.archlinux.org
-          - sgp.mirror.pkgbuild.com
     groups:
       - dev
       - tu

roles/mirror_load_balancer/templates/nginx.d.conf.j2

@@ -8,7 +8,7 @@ map $geoip2_data_continent_name $preferred_upstream {
     'Asia' jpn.mirror.pkgbuild.com;
     'Europe' ger.mirror.pkgbuild.com;
 #    'North America' mex.mirror.pkgbuild.com;
-    'Oceania' sgp.mirror.pkgbuild.com;
+    'Oceania' jpn.mirror.pkgbuild.com;
 #    'South America' mex.mirror.pkgbuild.com;
 }