ansible: remove unused host group

Fixes: 5324772 ("Remove a static log server")
Change-Id: I69e290e83a3184a96a0a28b8430c37225d5eb182
diff --git a/production b/production
index f5ef57f..d0a3977 100644
--- a/production
+++ b/production
@@ -11,4 +11,3 @@
 zuul-server
 nodepool
 gerrit
-ci-logs