Merge: + qlog: anonymize_client_ip setting

Close #916

* commit 'a0be7f5566a7d5986eb04ed7ffb79c5230171e2a':
  + client: handle hide_client_ip
  + qlog: hide_client_ip setting

AGHTechDoc.md

@@ -1287,12 +1287,22 @@ Request:
 	{
 		"enabled": true | false
 		"interval": 1 | 7 | 30 | 90
+		"anonymize_client_ip": true | false // anonymize clients' IP addresses
 	}
 
 Response:
 
 	200 OK
 
+`anonymize_client_ip`:
+1. New log entries written to a log file will contain modified client IP addresses.  Note that there's no way to obtain the full IP address later for these entries.
+2. `GET /control/querylog` response data will contain modified client IP addresses (masked /24 or /112).
+3. Searching by client IP won't work for the previously stored entries.
+
+How `anonymize_client_ip` affects Stats:
+1. After AGH restart, new stats entries will contain modified client IP addresses.
+2. Existing entries are not affected.
+
 
 ### API: Get querylog parameters
 
@@ -1307,6 +1317,7 @@ Response:
 	{
 		"enabled": true | false
 		"interval": 1 | 7 | 30 | 90
+		"anonymize_client_ip": true | false
 	}