Decrease log level

The following detailed messages of a monitor of ping RA would be better classified as DEBUG.
```
Feb 28 14:38:41 bl460g1n6 attrd[31836]:     info: crm_client_new: Connecting 0x1b13290 for uid=0 gid=0 pid=32505 id=b20ca555-dd87-4fe7-880b-d19be248969d
Feb 28 14:38:41 bl460g1n6 attrd[31836]:     info: attrd_client_message: Broadcasting pingd[bl460g1n6] = 100 (writer)
Feb 28 14:38:41 bl460g1n6 attrd[31836]:     info: crm_client_destroy: Destroying 0 events
```
When a cluster is stable, user does not need detailed messages that are outputted periodically.