ceph: sample config should reflect actual defaults (#2228)

plugins/inputs/ceph/README.md

@@ -82,7 +82,7 @@ the cluster.  The currently supported commands are:
 
   ## Whether to gather statistics via ceph commands, requires ceph_user and ceph_config
   ## to be specified
-  gather_cluster_stats = true
+  gather_cluster_stats = false
 ```
 
 ### Measurements & Fields:

plugins/inputs/ceph/ceph.go

@@ -68,7 +68,7 @@ var sampleConfig = `
   gather_admin_socket_stats = true
 
   ## Whether to gather statistics via ceph commands
-  gather_cluster_stats = true
+  gather_cluster_stats = false
 `
 
 func (c *Ceph) SampleConfig() string {