Remove longview setup for servo-master Linode exodus

Longview is Linode's proprietary monitoring service. We are moving the servo-master machine from Linode to EC2, so we can and will no longer use Longview, so this commit removes it.
servo · bors-servo · Mar 28, 2016 · Mar 28, 2016 · Mar 28, 2016 · b979215327b83da7cd931cb80113720c0458e8aa
commit b979215327b83da7cd931cb80113720c0458e8aa
diff --git a/longview/init.sls b/longview/init.sls
diff --git a/top.sls b/top.sls
@@ -34,4 +34,3 @@ base:
     - buildbot.master
     - homu
     - nginx
-    - longview