Auth: excessive session update

[szolin]

from user's logs on windows:

2019/10/21 13:04:03 14004#31 [debug] Auth: stored session in DB
2019/10/21 13:04:03 14004#31 [debug] GET /control/safebrowsing/status
2019/10/21 13:04:03 14004#85 [debug] Auth: stored session in DB
2019/10/21 13:04:03 14004#85 [debug] GET /control/blocked_services/list
2019/10/21 13:04:03 14004#116 [debug] Auth: stored session in DB
2019/10/21 13:04:03 14004#116 [debug] GET /control/stats_info
2019/10/21 13:04:03 14004#83 [debug] Auth: stored session in DB
2019/10/21 13:04:03 14004#83 [debug] GET /control/querylog_info
2019/10/21 13:04:03 14004#48 [debug] Auth: stored session in DB
2019/10/21 13:04:03 14004#48 [debug] GET /control/filtering/status
2019/10/21 13:04:03 14004#116 [debug] Auth: stored session in DB
2019/10/21 13:04:03 14004#116 [debug] GET /control/parental/status
2019/10/21 13:04:03 14004#116 [debug] Auth: stored session in DB
2019/10/21 13:04:03 14004#116 [debug] GET /control/safesearch/status
2019/10/21 13:04:07 14004#116 [debug] Auth: stored session in DB
2019/10/21 13:04:07 14004#116 [debug] POST /control/blocked_services/set

[szolin]

There will be improved logging after #1006